Writhing Necromass

This spell costs {1} less to cast for each creature card in your graveyard.
Deathtouch

Repository Skaab

Exploit (When this creature enters, you may sacrifice a creature.)
When Repository Skaab exploits a creature, return target instant or sorcery card from your graveyard to your hand.

Swamp

Exhume

Each player puts a creature card from their graveyard onto the battlefield.

Mire Triton

Deathtouch
When Mire Triton enters, mill two cards and you gain 2 life. (To mill a card, put the top card of your library into your graveyard.)

Armored Skaab

When Armored Skaab enters, mill four cards.

Selhoff Entomber

{T}, Discard a creature card: Draw a card.

Island

Wailing Ghoul

When Wailing Ghoul enters, mill two cards.

Organ Hoarder

When Organ Hoarder enters, look at the top three cards of your library, then put one of them into your hand and the rest into your graveyard.

Skaab Goliath

As an additional cost to cast this spell, exile two creature cards from your graveyard.
Trample

Mana Leak

Counter target spell unless its controller pays {3}.

Laboratory Brute

When Laboratory Brute enters, mill four cards.

Tome Scour

Tolarian Winds

Discard all the cards in your hand, then draw that many cards.

Summon Undead

You may mill three cards. Then return a creature card from your graveyard to the battlefield. (To mill a card, put the top card of your library into your graveyard.)