Kaya the Inexorable + Wormfang Manta + Tocatli Honor Guard + Carrion Feeder

Kaya the Inexorable

Wormfang Manta

Tocatli Honor Guard

Carrion Feeder

How it works

1. Activate Kaya the Inexorable's first ability by putting a loyalty counter on it, putting a ghostform counter on Wormfang Manta.
2. Activate Carrion Feeder by sacrificing Wormfang Manta.
3. When Wormfang Manta dies, its second ability and its ghostform ability trigger.
4. Resolve the ghostform trigger, returning Wormfang Manta from your graveyard to your hand and creating a 1/1 Spirit creature token.
5. Resolve the second trigger, causing you to take an extra turn after this one.
6. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
7. Cast Wormfang Manta by paying 5.
8. Wormfang Manta's first ability does not trigger due to Tocatli Honor Guard.
9. Repeat each turn.

This clever loop achieves infinite turns by exploiting the delayed-trigger safety valve on Wormfang Manta. By using Kaya the Inexorable's plus ability to place a ghostform counter on the Manta, you ensure that whenever Carrion Feeder sacrifices it, it conveniently returns straight to your hand while simultaneously triggering its leave-the-battlefield extra turn. The brilliant secret to bypassing the Manta's built-in drawback—which would normally make you skip your next turn when it enters—is Tocatli Honor Guard, whose static ability shuts down entering-the-battlefield triggers entirely so you only reap the rewards of taking infinite extra turns.