Wailing Ghoul

When Wailing Ghoul enters, mill two cards. (Put the top two cards of your library into your graveyard.)

Sultai Skullkeeper

When Sultai Skullkeeper enters, mill two cards.

Island

Eye Collector

Flying
Whenever Eye Collector deals combat damage to a player, each player mills a card. (Each player puts the top card of their library into their graveyard.)

Screeching Sliver

All Slivers have "{T}: Target player mills a card."

Organ Grinder

{T}, Exile three cards from your graveyard: Target player loses 3 life.

Dismal Backwater

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {U} or {B}.

Screeching Skaab

When Screeching Skaab enters, mill two cards.

Swamp

Cathartic Adept

Deranged Assistant

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Stinkweed Imp

Flying
Whenever Stinkweed Imp deals combat damage to a creature, destroy that creature.
Dredge 5 (If you would draw a card, you may mill five cards instead. If you do, return this card from your graveyard to your hand.)

Thought Scour

Target player mills two cards.
Draw a card.

Haunting Misery

As an additional cost to cast this spell, exile X creature cards from your graveyard.
Haunting Misery deals X damage to target player or planeswalker.