Kaya the Inexorable + Wormfang Manta + Torpor Orb + Phantom Train

Kaya the Inexorable

Wormfang Manta

Torpor Orb

Phantom Train

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 Phantom Train 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 Phantom Train ability
7. Cast Wormfang Manta by paying 5.
8. Wormfang Manta's first ability does not trigger due to Torpor Orb.
9. Repeat each turn.