Nimble Mongoose

Shroud (This creature can't be the target of spells or abilities.)
Threshold — This creature gets +2/+2 as long as seven or more cards are in your graveyard.

Compost

Whenever a black card is put into an opponent's graveyard from anywhere, you may draw a card.

Rushing River

Kicker—Sacrifice a land. (You may sacrifice a land in addition to any other costs as you cast this spell.)
Return target nonland permanent to its owner's hand. If this spell was kicked, return another target nonland permanent to its owner's hand.

Wonder

Flying
As long as this card is in your graveyard and you control an Island, creatures you control have flying.

Breakthrough

Draw four cards, then choose X cards in your hand and discard the rest.

Careful Study

Mental Note

Ray of Revelation

Destroy target enchantment.
Flashback {G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Yavimaya Coast

{T}: Add {C}.
{T}: Add {G} or {U}. This land deals 1 damage to you.

Island

Repulse

Return target creature to its owner's hand.
Draw a card.

Disrupt

Counter target instant or sorcery spell unless its controller pays {1}.
Draw a card.

Seton's Scout

Reach (This creature can block creatures with flying.)
Threshold — This creature gets +2/+2 as long as seven or more cards are in your graveyard.

Roar of the Wurm

Create a 6/6 green Wurm creature token.
Flashback {3}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Forest

Genesis

At the beginning of your upkeep, if this creature is in your graveyard, you may pay {2}{G}. If you do, return target creature card from your graveyard to your hand.

Werebear

{T}: Add {G}.
Threshold — This creature gets +3/+3 as long as seven or more cards are in your graveyard.

Phantom Centaur

Protection from black
This creature enters with three +1/+1 counters on it.
If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature.

Wild Mongrel

Discard a card: This creature gets +1/+1 and becomes the color of your choice until end of turn.