MTG Salvation

Sakura-Tribe Scout, Skyshroud Ranger, Exploration:
These cards enable the crucial turn two Edric while developing your mana. These are usually the best turn one play if you have several options. During the first few turns of the game, putting an extra land on the battlefield is generally better than tapping for a mana. As long as you're hitting your land drops Sakura-Tribe Scout and Skyshroud Ranger speed you up a turn while still being able to attack. Exploration gives you the land right away, which can lead to powerful turns early on.

Elvish Mystic, Llanowar Elves, Fyndhorn Elves, Arbor Elf, Boreal Druid:
The rest of the creatures that accelerate you into turn two Edric. These aren't quite as good early on, but later when you've run out of lands in hand they can still tap for mana. When attacking with mana creatures, it's important to consider if you'll have enough mana to cast an extra turn you might draw. If you need to immediately find an extra turn card to start the extra turn chain, you'll want to make sure you have five mana available post combat. You may need to hold some mana creatures back. Make sure you have a forest to go along with Arbor Elf in your opening hand when you're deciding what cards to keep. Boreal Druid is clearly the worst here as the deck doesn't have much use for colorless mana, but turn two Edric is just that important.

Chrome Mox, Mox Diamond, Gemstone Caverns:
These are the worst mana accelerants in the deck as they cost you an extra card and can't attack to draw cards. Say it with me, "Turn two Edric is just that important." Besides, the deck draws enough extra cards in the long run to make up for the early card disadvantage. Still, these cards can lead to some busted turn ones where you play a couple of attackers and end up drawing 2-3 extra cards on your second turn. Chrome Mox and Mox Diamond are also great when you've drawn a ton of cards as they let you make use of cards that you would otherwise discard. Note that if you're going first, you can't use Gemstone Caverns's ability that lets you start with it on the battlefield. Consider mulliganing it away when going first.

Mana Crypt, Sol Ring:
Most Edric players don't run these cards because of the deck's low mana curve and lack of colorless mana costs. TURN TWO EDRIC IS JUST THAT IMPORTANT. These cards, along with Gaea's Cradle let you have five mana on turn three to start chaining your extra turns as early as possible. They're also pretty great for recasting Edric when he gets killed. These two cards are worse here than in most any other EDH deck, but they're still broken and they still belong.

Carpet of Flowers:
This is either your best mana accelerant or your worst. Note that the Oracle wording allows you to choose either your first or second main phase to get the mana. Generally, you'll do this in the second main phase unless you're casting Edric. It's best to wait so you know what kind of mana you'll need and to be able to play any cards you drew during combat. Obviously, if you don't play against blue on a regular basis, you may want to cut it, but who doesn't sit across from blue decks on the regular?

Memnite, Slither Blade, Faerie Miscreant Jace's Phantasm, Triton Shorestalker, Gudul Lurker:
These are your bread and butter, difficult to block creatures for drawing cards with Edric. Faerie Miscreant lets you cycle Phantasmal Image and Sakashima's Student if you're desperate. It's also a nice target for kicked Rite of Replication if you're running it. Jace's Phantasm can sometimes kill quickly late in the game, but this usually isn't the case.

Merfolk Spy, Grayscaled Gharial:
Like Carpet of Flowers, these are either the best or worst at what they do. You'll probably want to replace these with more fliers if you don't play against blue decks regularly, but who doesn't?

Wingcrafter, Hypnotic Siren:
Wingcrafter lets you turn Edric or a mana dork into a flier. Hypnotic Siren lets you take a creature late in the game. It also works as an answer to Llawan, Cephalid Empress since it's not a blue creature spell if you cast it for its bestow cost.

Mausoleum Wanderer:
There's no way to get its power any higher, but it's perfectly fine as is. Flies and potentially counters a spell or makes every instant and sorcery your opponents cast cost one more mana.

Hope of Ghirapur:
This is a fantastic little flier that can guarantee your extra turn resolves in a pinch. It can also shut down an opposing storm or combo deck from winning for a turn if need be.

Sylvan Safekeeper, Eladamri, Lord of Leaves:
These creatures protect Edric from targeted removal. Nothing throws a wrench in your plans like Edric being killed during combat. Sylvan Safekeeper is great because it can easily come down before Edric and is itself difficult to remove. Sacrificing a land is a steep cost, but losing Edric is even worse. Eladamri, Lord of Leaves has the added bonus of making Edric and your mana dorks unblockable against green players. Note that in Eladamri's Oracle text he is an elf, but does not give himself shroud and forestwalk.

Phantasmal Image, Sakashima's Student:
Phantasmal Image is at worst a slightly overcosted evasive creature. At best, it's a big nasty creature thanks to your opponents or a copy of Eternal Witness to keep the extra turn chain going. Sakashima's Student is basically the same thing, but you can use ninjutsu to copy Llawan, Cephalid Empress. Note that you can use ninjutsu after damage if you need to deal combat damage with a rogue for prowl.

It's also really funny to copy your Edric when an opponent steals it. When that happens, you win so hard it hurts.

Reclamation Sage:
Sometimes you have to blow up an artifact or enchantment. Stranglehold, Defense of the Heart, Blood Moon and Ensnaring Bridge are some of her favorite targets.

Eternal Witness:
She's the salt of the earth. She usually returns an extra turn card to your hand and then attacks every turn to draw you even more cards. Often cloned, searched out and bounced for great value. Allows you to take infinite extra turns with Rite of Replication and an extra turn card, but this usually isn't necessary.

Mental Misstep:
Protects Edric from common spot removal like Swords to Plowshares and Pyroblast without needing to leave mana open. The look on your opponent's face is priceless when you counter his turn one Sol Ring or Mana Vault. When Mental Misstep is in your opening hand, it's generally best to counter the first powerful one mana spell like the aforementioned mana rocks or a topdeck tutor like Mystical Tutor. If your opponents get too far ahead of you, it won't matter that you can counter their removal for Edric as he won't have time to win you the game.

Swan Song, Spell Pierce, Flusterstorm:
These are the best one mana counterspells this deck can run. Swan Song is not without risk as giving an opponent a 2/2 flier when you're running lots of 1/1 fliers can be a problem. However, being able to stop removal, counterspells or sweepers played against you is important enough to risk it. Note that if you're trying to chain extra turns and your opponents aren't interrupting you, you could use Swan Song to counter one of your own spells to get another attacker.

Delay, Negate, Daze, Arcane Denial, Unified Will, Counterspell, Mana Drain:
These are the best two mana counterspells this deck can run. Mana Drain is not at its best here due to the lack of colorless mana in the deck's casting costs, but it's still a two mana counterspell. The mana it generates is often crucial for casting Edric after he's died or for casting extra turns. Three mana is too much to pay for a counterspell in this deck. Mana is really tight until the late game where you should be chaining extra turns anyway.

Force of Will:
The best free countermagic Edric can run. The loss of a card is easily made up for by Edric's card drawing.

Muddle the Mixture:
The deck's Swiss army knife. It's great for countering the nasty sweepers, removal and counterspells that threaten Edric. When chaining extra turns, it can be transmuted for Regrowth to keep the chain going. Need to answer a problem permanent or permanents? Search for Cyclonic Rift. Want to proactively protect Edric? Muddle the Mixture becomes Eladamri, Lord of Leaves or Spellskite. Jealous of your opponent's awesome creature? Get your own with Phantasmal Image. If only every card in the deck did this much work.

Unsubstantiate:
The deck's other Swiss army knife. It bounces a problematic creature so you can attack or delays a big spell for a turn. Note that it can also be used to bounce your Eternal Witness to get a card out of your graveyard.

Time Warp, Temporal Manipulation, Capture of Jingzhou, Walk the Aeons:
These are your bread and butter extra turn cards. Don't neglect Walk the Aeons's buyback, as this will often let you continue an extra turn chain that would otherwise be forced to stop. It's also why if you don't particularly need one kind of mana over another you should fetch an Island over a Forest. If you need a five mana extra turn because you don't have Notorious Throng mana, it's also better to tutor for Temporal Manipulation or Capture of Jingzhou instead of Time Warp to play around Misdirection and the like.

Part the Waterveil:
The exile clause is annoying, but it's still an extra turn card. Ideally, you'll want to cast it with Awaken to get another attacker on your extra turn and, if you have enough mana, your current turn. The 6/6 it makes is a nice backup plan for finishing people off if something goes wrong with Notorious Throng.

Temporal Mastery:
This is a card that many people don't run in their Edric lists because it's much more likely to be drawn when you can't cast it for its miracle cost. It also costs more mana than the previously mentioned extra turns and doesn't play nice with Regrowth effects. That said, it's still an extra turn card and there's nothing this deck wants to draw more in the mid and late game. When you do get to miracle this it's absolutely absurd, but that's more of a bonus. A common trap is to tutor for this with Personal Tutor or Mystical Tutor so you can cast it for 1U. Rarely is this correct. Remember that you need to cast lots of extra turns to win and exiling stops the crucial Regrowth effects. Generally, you're going to want Notorious Throng, or if your desperate and short on mana, Knowledge Exploitaton or one of the five mana extra turns.

Notorious Throng:
Hands down the best card in the deck. Edric is a rogue, which means we always have the creature type for prowl. Can't get through with Edric or another rogue? Just cast it to create enough rogues to prowl it on a future turn. Not only does it take an extra turn, it also produces a large number of attackers to draw you more cards. Regrowing Notorious Throng feels so good it should be illegal. Every time you cast this, you're effectively doubling the number of card drawing attackers you have. Casting this 2-3 times can give you almost 40 power of creatures. This is how you actually kill people. I wish I could run twenty of this card.

Knowledge Exploitation:
This is very metagame dependent. If your opponents aren't running extra turn cards, it's going to under perform. It can still help by finding you tutors or Regrowth effects, but it generally won't be worth it if that's what it's doing. If someone runs Time Stretch, start with that. The next best target is Temporal Mastery as it's the best one for them to top deck and they can't get it out of their graveyard later. Knowledge Exploitation is especially good when you're light on mana as it can let you start your extra turn chain from only four mana.

Personal Tutor, Mystical Tutor:
These are basically additional extra turn cards. You're going to want to get Notorious Throng if you can prowl it. The important thing when playing this deck is to get the extra turn chain started as soon as possible. If you don't have seven mana to tutor for and prowl Notorious Throng, don't be afraid to tutor for Temporal Manipulation or Capture of Jingzhou (requires six mana) or Knowledge Exploitation (requires five mana). Note that each creature you deal combat damage with creates a separate Edric trigger that can be responded to. If you're drawing four cards and don't have an extra turn, you can use your first three triggers to try to draw one. If you don't find an extra turn, you can cast Mystical Tutor in response to the fourth draw trigger.

Long-Term Plans:
Long-Term Plans functions like the other instant speed tutors in the deck except that it costs three mana and you need to cast it when you have three draw triggers remaining to get the tutored card immediately. It's not the best at what it does, but it's definitely worth running.

Green Sun's Zenith:
The deck's other Swiss army knife along with Muddle the Mixture. Green Sun's Zenith can find Dryad Arbor on turn one to enable a turn two Edric while being a more immediate, but limited Worldly Tutor later on.

Crop Rotation, Sylvan Scrying:
These are effectively Gaea's Cradle number two and three. The large number of inexpensive creatures in the deck allows these cards to often function as a more permanent green Dark Ritual. Wait until your second main phase to play your land for the turn if possible so that if you draw Sylvan Scrying you can find and play Gaea's Cradle. If you already have Gaea's Cradle, the next best targets are usually Dryad Arbor, Flooded Grove, Pendelhaven in that order.

Noxious Revival, Regrowth:
These are the most efficient ways to keep an extra turn chain going. It's best to use these on Notorious Throng to maximize your ability to actually kill your opponents, but don't stop an extra turn chain because you don't have Notorious Throng yet. Noxious Revival can also put cards on top of an opponent's deck, but I've only used that functionality once. It's something to consider if you're working with other players to stop the biggest threat at the table and one of them has an answer in their graveyard.

Snapcaster Mage:
Can keep an extra turn chain going in a pinch, but it's best to avoid this if possible since flashback exiles the extra turn. Again, don't break an extra turn chain because you don't want to exile your extra turn. The exception to this is possibly not wanting to exile Notorious Throng if you can't prowl it for a large enough number to kill the entire table, but it hasn't come up for me yet. It's best to use Snapcaster Mage to flashback a Noxious Revival, etc. if possible to keep extra turn cards in your graveyard. Snapcaster Mage also often functions as Mystic Snake when you need a counterspell.

Cyclonic Rift:
Secret extra turn #1. If you overload this, your opponents basically have to skip their turns to rebuild their board positions. Keep that in mind when you're chaining extra turns. Cyclonic Rift also functions as a catch-all for problem permanents.

Treachery:
Sometimes everyone has a blocker and you can't get through with a significant chunk of your army. Treachery can clear the way without costing you mana. If you have Gaea's Cradle, Treachery can even create mana! Not to mention you get an extra attacker going forward. You could just randomly steal the best creature on the board as well.

The Manabase:
There's not much to say here. All lands should be run that make blue and green mana while coming in untapped most of the time. Be careful with your fetchlands. It's often best to use a non-green one first so that when you're mana flooded you can turn a green fetchland draw into extra attacker via Dryad Arbor.

Talent of the Telepath:
These are very metagame dependent. If your opponents aren't running extra turn cards, they're going to under perform. They can still help by finding you tutors or Regrowth effects, but they generally won't be worth it if that's what they're doing. If someone runs Time Stretch, start with that. The next best target is Temporal Mastery as it's the best one for them to top deck and they can't get it out of their graveyard later. Knowledge Exploitation is especially good when you're light on mana as it can let you start your extra turn chain from only four mana.

Spellskite
Spellskite is the worst here as it can't draw you cards. It does do some nice things for you though like ruin Arcum Dagsson's day and make Power Artifact combo decks very sad.

Tangle Wire:
Secret extra turn #2. Due to the large number of inexpensive permanents and the way triggers stack, this will slow down your opponents much more than yourself. You'll want to stack the Tangle Wire triggers so that you remove a counter before you tap your permanents. Remember, Tangle Wire is a permanent you can tap for its trigger. Often you'll get effectively two extra turns out of Tangle Wire, but there are many board states where it's worthless as well. Be careful when casting it. This card also makes people rage more than most. I will not be responsible for hurt feelings and damaged friendships.

Galerider Sliver, Cloud Sprite, Flying Men, Zephyr Sprite

Skullwinder:You have to be careful with Skullwinder as giving your opponents cards back can be problematic, but he has a much better body than Eternal Witness.

Dispel

Misdirection: Note that Misdirection can counter counterspells by changing their target to Misdirection. The Misdirection finishes resolving and since the counterspell has no legal target it is countered by the game. But Misdirection has a better use: You can redirect an extra turn spell that targets a player to yourself. These are Time Warp, Walk the Aeons, Beacon of Tomorrows and Time Stretch.

Bribery

Reclaim

Worldly Tutor:
This one isn't quite as good as Personal Tutor and Mystical Tutor, but it can still help keep the extra turn chain going by finding Eternal Witness or a clone to copy it. Worldly Tutor also finds your utility creatures like Eladamri, Lord of Leaves and Reclamation Sage. It's also gets you out from under Llawan, Cephalid Empress by finding Sakashima's Student.