Blink Wormfang Manta using Soulherder. Wormfang Manta's first ability won't trigger due to Doorkeeper Thrull.
Wormfang Manta's second ability triggers, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Lock

Wormfang Manta

Doorkeeper Thrull

Soulherder

Activate Flickerform by paying {2}{W}{W}, exiling Wormfang Manta and all Auras attached to it.
When Wormfang Manta leaves the battlefield, its second ability triggers, causing you to take an extra turn after this one.
At the beginning of your end step, Flickerform triggers, returning Wormfang Manta from exile to the battlefield, and then returning all Auras that were attached to Wormfang Manta from exile to the battlefield attached to Wormfang Manta.
Wormfang Manta's first ability does not trigger due to Doorkeeper Thrull.
Repeat each turn.

Combos with "Doorkeeper Thrull"