Drowned Catacomb

This land enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.

Swamp

Necrogen Spellbomb

{B}, Sacrifice this artifact: Target player discards a card.
{1}, Sacrifice this artifact: Draw a card.

Cephalid Looter

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

Geth's Grimoire

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

Megrim

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

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.

Hypnotic Specter

Flying
Whenever this creature 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 this artifact: Return target creature to its owner's hand.
{1}, Sacrifice this artifact: Draw a card.

Boomerang

Return target permanent to its owner's hand.

Recoil

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

Island

Warped Devotion

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