Activate Eater of the Dead by tapping it, causing a player to mill cards equal to its toughness.
Activate Eater of the Dead by paying {0}, exiling a creature card from a graveyard and untapping Eater of the Dead.
Repeat as able.

Near-infinite mill

Near-infinite self-mill

Phenax, God of Deception

Eater of the Dead

Give Eater of the Dead deathtouch by any method.
Activate Eater of the Dead by tapping it, dealing 1 damage to any nontoken creature an opponent controls.
The creature dies due to Eater of the Dead's deathtouch.
Activate Eater of the Dead by paying {0}, exiling the creature card from its owner's graveyard  and untapping Eater of the Dead.
Repeat.
You may also repeat this loop whenever a creature enters the battlefield under an opponent's control.

Destroy all creatures that enter the battlefield under an opponent's control

Destroy any number of creatures opponents control

Exile all creature cards that are put into an owner's graveyard

Viridian Longbow

Activate Eater of the Dead by paying {0}, targeting any creature card in a graveyard.
Crackdown Construct triggers, giving itself +1/+1 until end of turn.
Repeat.

Infinitely large Crackdown Construct until end of turn

Crackdown Construct

Activate Eater of the Dead by tapping it, dealing 1 damage to any nontoken creature an opponent controls.
The creature dies due to Eater of the Dead's deathtouch.
Activate Eater of the Dead by paying {0}, exiling the creature card from its owner's graveyard  and untapping Eater of the Dead.
Repeat.
You may also repeat this loop whenever a creature enters the battlefield under an opponent's control.

Combos with "Eater of the Dead"