Kaya the Inexorable + Wormfang Manta + Tocatli Honor Guard + Yahenni, Undying Partisan

Kaya the Inexorable

Wormfang Manta

Tocatli Honor Guard

Yahenni, Undying Partisan

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 Yahenni 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 Yahenni ability, giving it indestructible until end of turn.
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.