You cast them in any order you choose, so the copy of Relearn doesn't go on the stack until after the copy of Pull from Eternity has resolved.
EDIT: Added rulings on the card that I think support my claim
10/1/2005: When the ability resolves, the player copies all cards exiled with Eye of the Storm, not just the cards he or she owns. That player then chooses which of those copies to cast, if any. All chosen copies are cast in the order the player chooses.
10/1/2005: The player chooses modes, pays additional costs, chooses targets, and so on for the copies when casting them. Any X in the mana cost of a copy cast this way will be 0. Alternative costs can’t be paid.
Runic Repetition requires any 1-mana flashback spell and a Twiddle effect and works in pretty much the same way.
The following 1 mana spells have flashback and can end the game when cast an arbitrary number of times:
Faithless Looting gets an honorable mention here because it will let you loot through your whole deck, presumably finding one of these spells or a different way to win. Also, if you have a Ravnica bounceland or something else that taps for 2 or more mana, you can branch into using flashback spells with higher CMCs.
I'd cut Omniscience, Show and Tell, and either Capsize or High Tide. Presumably your plan A is to tutor Enter the Infinite to the top of your library and cast it for free with Jeleva. If you do that and untap, you have so much fast mana and free counterspells that should be able to stick a Laboratory Maniac and a card draw spell to win the game on the spot. As such, Omniscience seems like overkill. I don't see anything in the list worth cheating out with Show and Tell besides Omniscience, so Show and Tell gets the axe. I think Capsize is probably too mana intensive for this deck. You can generate arbitrary amounts of mana with Dramatic Reversal, Isochron Scepter, and some mana rocks, but that seems inconsistent enough that Capsize is basically an expensive Boomerang in most situations. As for High Tide, without knowing what your mana base looks like, I can't really judge how often it will net you a significant amount of mana, but it only really synergizes with Time Spiral and Gush.
Depending on the deck and maybe the tutors that you're running, sometimes including a 2-3 card combo that can win you the game out of nowhere can be worth it. For example, it's fairly common to include a copy of Firemind's Foresight in many Izzet decks because by itself it can find Lightning Bolt, Reset, and Reiterate. In these decks, Firemind's Foresight is a one-card win condition because it finds both an infinite mana combo and and infinite damage combo by itself. The combo is compact enough and the pieces are flexible enough that it doesn't bring the power level of your deck down very much to do it.
Three card combos are inherently unreliable in 100 card singleton decks anyway. In order to give that sort of thing a shot at working out, you'll want access to black's unconditional tutors. Also, with access to black, you can add Neverending Torment to increase the redundancy of cards you can use to force your opponents to kill one another.
Temmet encourages attacking with a single huge creature, so I'd look for cards that make large tokens. Someone has already mentioned Phyrexian Processor, which I think is the best thing to do with Temmet. Equipment with the Living Weapon abiliy can bring their own tokens, Bonehoard, Scytheclaw, and Batterskull being the equipment with the highest impact. Helm of Kaldra can cheaply generate a huge token if you've got both Sword of Kaldra and Shield of Kaldra lying around. Azorius has enough Equipment/Artifact tutors and card draw that you could conceivably assemble the set.
Creature Teferi really only lends himself to doing griefy things. You're either going to be playing a suboptimal deck that has to deal with the fact that people will make decisions with the expectation that you will grief them, or you're going to play a griefy deck. Neither of those seem ideal.
Unfortunately, there are only a small subset of Madness cards that are powerful enough for Commander.
Asylum Visitor - Antithetical to staying Hellbent, but synergizes with forcing other people to discard their hands
Big Game Hunter - Kills most relevant creatures in Commander.
Bloodhall Priest - Sort of just an efficient dude if you can discard it for free
From Under the Floorboards - 5 mana for 3 2/2s and 3 life is fine. If you can discard this for free, you get a great rate on your tokens.
Gibbering Descent - Hits everyone else before you, and if you're building to leverage the discard anyway, it should be all upside.
Stromkirk Occultist - Impulsive draw is like drawing cards except it doesn't break your hellbent-ness.
Voldaren Pariah - BBB Is sometimes pretty hard to consistently have early on in a multicolor deck, but this thing has insane synergy with a lot of staxy cards like Grave Pact.
Here are some cards you might not mind discarding because you can cast them from the graveyard.
Seize the Day - This has decent synergy with the new Minotaur legend.
Sever the Bloodline - Really only useful if you want to kill one kind of token and leave the others untouched, since Ratchet Bomb exists in every color identity.
There are also some insanely mean discard spells you could utilize, like Mindslicer and Sire of Insanity. Cabal Conditioning and Capital Punishment usually result in most of your opponents having zero cards in hand as well. Uba Mask downgrades all card draw to impulsive card draw, which is useful for keeping hand sizes low.
I wouldn't go too deep on the tribal aspect of the new Minotaur guy, because almost every single minotaur in MTG is a vanilla 2/3, but you can make all of your creatures into minotaurs utilizing Conspiracy.
EDIT: Added rulings on the card that I think support my claim
Runic Repetition requires any 1-mana flashback spell and a Twiddle effect and works in pretty much the same way.
The following 1 mana spells have flashback and can end the game when cast an arbitrary number of times:
Edit: replacing Grim Poppet with Quillspike removes the need for Hapatra at all, though.
Here are some cards you might not mind discarding because you can cast them from the graveyard.
There are also some insanely mean discard spells you could utilize, like Mindslicer and Sire of Insanity. Cabal Conditioning and Capital Punishment usually result in most of your opponents having zero cards in hand as well. Uba Mask downgrades all card draw to impulsive card draw, which is useful for keeping hand sizes low.
I wouldn't go too deep on the tribal aspect of the new Minotaur guy, because almost every single minotaur in MTG is a vanilla 2/3, but you can make all of your creatures into minotaurs utilizing Conspiracy.
Haha. I made the same goofy mistake :c
Tuskcaller doesn't produce enough creatures to untap itself with Umbral Mantle and Phyrexian Altar.
This doesn't work because tracker can't make Sekki fight itself.