Island

Cognivore

Flying
Cognivore's power and toughness are each equal to the number of instant cards in all graveyards.

Dimir Guildgate

Dimir Guildgate enters tapped.
{T}: Add {U} or {B}.

Boomerang

Return target permanent to its owner's hand.

Simic Guildgate

Simic Guildgate enters tapped.
{T}: Add {G} or {U}.

Geth's Grimoire

Whenever an opponent discards a card, you may draw a card.

Unsummon

Return target creature to its owner's hand.

Megrim

Whenever an opponent discards a card, Megrim deals 2 damage to that player.

Recoil

Return target permanent to its owner's hand. Then that player discards a card.

Library of Leng

You have no maximum hand size.
If an effect causes you to discard a card, discard it, but you may put it on top of your library instead of into your graveyard.

Yavimaya Coast

{T}: Add {C}.
{T}: Add {G} or {U}. Yavimaya Coast deals 1 damage to you.

Withdraw

Return target creature to its owner's hand. Then return another target creature to its owner's hand unless its controller pays {1}.

Gaea's Skyfolk

Snap

Return target creature to its owner's hand. Untap up to two lands.

Aether Burst

Return up to X target creatures to their owners' hands, where X is one plus the number of cards named Aether Burst in all graveyards as you cast this spell.

Capsize

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Return target permanent to its owner's hand.

Forest

Golgari Guildgate

Golgari Guildgate enters tapped.
{T}: Add {B} or {G}.

Warped Devotion

Whenever a permanent is returned to a player's hand, that player discards a card.