Phantom Steed + Godo, Bandit Warlord + Wormfang Drake + Arcane Adaptation + Tannuk, Steadfast Second

Phantom Steed

Godo, Bandit Warlord

Wormfang Drake

Arcane Adaptation

Tannuk, Steadfast Second

How it works

1. Declare Phantom Steed and Godo as attackers, triggering each of their second abilities.
2. Resolve the Godo trigger, untapping all creatures you control and causing you to get an additional combat phase after this one.
3. Resolve the Phantom Steed trigger, creating a token copy of Wormfang Drake.
4. When the token Wormfang Drake enters the battlefield, its first ability triggers, exiling Godo.
5. At the end of your combat phase, Phantom Steed triggers, causing you to sacrifice the Wormfang Drake token.
6. When the token Wormfang Drake leaves the battlefield, its second ability triggers, returning Godo from exile to the battlefield.
7. When Godo enters the battlefield, its first ability triggers, allowing you to search your library for an Equipment card and put it onto the battlefield.
8. Repeat each combat phase.

This loop relies on Arcane Adaptation naming "Samurai" to turn all your creatures into Samurai, allowing Godo, Bandit Warlord's extra combat trigger to untap your entire board. As Phantom Steed and Godo attack, Phantom Steed spawns a token copy of Wormfang Drake, whose entry trigger temporarily exiles Godo. When that Wormfang Drake token is sacrificed at the end of combat, it returns Godo to the battlefield, triggering Godo once more to fetch another Equipment card straight from your library. Meanwhile, Tannuk, Steadfast Second ensures your newly returning creatures can instantly join the fray with haste, perpetuating an endless cycle of combat phases and ETB triggers.