Warped Devotion

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

Island

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.

Mystic Snake

Flash
When Mystic Snake enters the battlefield, counter target spell.

Recoil

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

Repulse

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

Snap

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

Unsummon

Return target creature to its owner's hand.

Withdraw

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

Yavimaya Coast

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

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.

Boomerang

Return target permanent to its owner's hand.

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.

Cognivore

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

Forest

Gaea's Skyfolk

Geth's Grimoire

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

Dimir Guildgate

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

Golgari Guildgate

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

Megrim

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

Simic Guildgate

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

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