Warped Devotion

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

Island

Wash Out

Return all permanents of the color of your choice to their owners' hands.

Swamp

Geth's Grimoire

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

Hypnotic Specter

Flying
Whenever Hypnotic Specter deals damage to an opponent, that player discards a card at random.

Go Blank

Target player discards two cards. Then exile that player's graveyard.

Aether Spellbomb

{U}, Sacrifice Aether Spellbomb: Return target creature to its owner's hand.
{1}, Sacrifice Aether Spellbomb: Draw a card.

Necrogen Spellbomb

{B}, Sacrifice Necrogen Spellbomb: Target player discards a card.
{1}, Sacrifice Necrogen Spellbomb: Draw a card.

Cephalid Looter

{T}: Target player draws a card, then discards a card.

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.

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.

Boomerang

Return target permanent to its owner's hand.

Drowned Catacomb

Drowned Catacomb enters the battlefield tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.