Mortuary + Amareth, the Lustrous + Omarthis, Ghostfire Initiate

Mortuary

Amareth, the Lustrous

Omarthis, Ghostfire Initiate

How it works

1. Cast Omarthis by paying 0.
2. Omarthis enters the battlefield and dies as a state-based action due to having zero toughness.
3. Mortuary and Amareth trigger.
4. Resolve the Mortuary trigger, putting Omarthis on top of your library from your graveyard.
5. Resolve the Amareth trigger, causing you to reveal Omarthis from the top of your library and put it into your hand.
6. Repeat.