I'm currently running around in EDH trying to build a Mono Green Control Deck with Multani, Yavimaya's Avatar. Here are a bunch of card designs I wish I could have in this deck:
Enlightened by Nature3GG
Sorcery
You draw X cards and gain X life, where X is equal to the number of Basic Lands you control.
-- I feel like this card would be amazing in mono green decks and in any decks running a big chunk of basics. I feel like this type of card could see print one day.
Sylvan Shroud1G
Instant
You gain Hexproof until end of turn. Prevent all damage that would be dealt to you this turn.
-- Just a more advanced Fog.
Return to the Wilds5GG
Sorcery
Each player puts each nonland permanent they own on the bottom of their library.
-- This is the hardest one to imagine seeing print, but I do think that if Green ever got a "Board Wipe", it would look something like this.
Return to the Wilds is a pie break. That's a white card, plain and simple. Board wipes (that hit creatures) are an extreme rarity in green, and you're not even attempting to make it color pie-friendly mechanically.
Enlightened by Nature should cost 2 more. As a 1:1 draw spell, it's simply too powerful to be at 5.
Enlighted by Nature is too strong and no longer green. 5 mana draw 5 gain 5 is absolutely insane. As a UG card I could see it at 6 or 7. Green has shifted away from land based draw, it now draws tied to creatures. So a creature with this as an ETB would be acceptable, probably at 5GGG with p/t equal to lands you control.
Sylvan Shroud, super fog is reasonable. It should actually fog though. The other complaint is the use of a keyword in name without using the keyword.
Return to the Wilds, a very reasonable white card. A green card would read noncreature instead of nonland, and would be unfun but printable.
I will give my two cents, but with Standard in mind:
Silverwhip WardenGG
Creature - Dryad (U)
Defender, Reach
When ~~ enters the battlefield, draw a card.
1/4
Day of the Wolves2GG
Sorcery
Create a 2/2 green Wolf creature token for each creature target opponent control.
Elvish Horticulture1GG
Enchantment
At the beginning of your end step, create a 0/1 green Plant creature token.
At the beginning of your upkeep you may sacrifice any number of plants. You gain 2 life for each Plant sacrificed this way, draw a card for each two plants sacrificed this way and create a 6/6 green Wurm creature with trample for each four plants sacrificed this way.
Oakskin Baloth1GG
Creature - Beast (R)
Flash 1G: ~~ gains indestructible until end of turn.
3/4
Wrath of Nature4GG
Creature - Elemental (M) 0: ~~ fights target creature. Activate this ability only any time you could cast a sorcery.
6/6
Enlightened by Nature 3GG
Sorcery
You draw X cards and gain X life, where X is equal to the number of Basic Lands you control.
-- I feel like this card would be amazing in mono green decks and in any decks running a big chunk of basics. I feel like this type of card could see print one day.
Sylvan Shroud 1G
Instant
You gain Hexproof until end of turn. Prevent all damage that would be dealt to you this turn.
-- Just a more advanced Fog.
Return to the Wilds 5GG
Sorcery
Each player puts each nonland permanent they own on the bottom of their library.
-- This is the hardest one to imagine seeing print, but I do think that if Green ever got a "Board Wipe", it would look something like this.
Dunes of Zairo
SHANDALAR
Innistrad - The Darkest Night
~THE RAVNICAN CONSORTIUM~
A Community Set
Commander: Allies & Adversaries
Enlightened by Nature should cost 2 more. As a 1:1 draw spell, it's simply too powerful to be at 5.
Sylvan Shroud, super fog is reasonable. It should actually fog though. The other complaint is the use of a keyword in name without using the keyword.
Return to the Wilds, a very reasonable white card. A green card would read noncreature instead of nonland, and would be unfun but printable.
Silverwhip WardenGG
Creature - Dryad (U)
Defender, Reach
When ~~ enters the battlefield, draw a card.
1/4
Day of the Wolves 2GG
Sorcery
Create a 2/2 green Wolf creature token for each creature target opponent control.
Elvish Horticulture 1GG
Enchantment
At the beginning of your end step, create a 0/1 green Plant creature token.
At the beginning of your upkeep you may sacrifice any number of plants. You gain 2 life for each Plant sacrificed this way, draw a card for each two plants sacrificed this way and create a 6/6 green Wurm creature with trample for each four plants sacrificed this way.
Oakskin Baloth1GG
Creature - Beast (R)
Flash
1G: ~~ gains indestructible until end of turn.
3/4
Wrath of Nature 4GG
Creature - Elemental (M)
0: ~~ fights target creature. Activate this ability only any time you could cast a sorcery.
6/6
BGU Control
R Aggro
Standard - For Fun
BG Auras