Mortuary + Sarcatog + Ornithopter + Gwenom, Remorseless

Mortuary

Sarcatog

Ornithopter

Gwenom, Remorseless

How it works

1. Activate Sarcatog by sacrificing Ornithopter
2. When Ornithopter dies, Mortuary triggers, putting Ornithopter from your graveyard onto the top of your library.
3. Resolve the Sarcatog ability.
4. Cast Ornithopter from the top of your library by paying 0 life.
5. Repeat.

This clever loop relies on Mortuary to intercept your creatures as they hit the graveyard, automatically recycling them back to the top of your library instead of letting them stay there. Sarcatog acts as the engine by sacrificing Ornithopter to fuel its activation, which in turn triggers the graveyard-sorting enchantment. Once Ornithopter is safely back on top of your library, Gwenom, Remorseless steps in to let you cast it directly from the library while generously paying its zero-mana value with zero life.