Requires

Feldon of the Third Path must be on the battlefield. Atsushi, the Blazing Sky must be in the graveyard. Thornbite Staff must be on the battlefield. Krark-Clan Ironworks must be on the battlefield. Thornbite Staff attached to Feldon. Feldon does not have summoning sickness. Mana needed:

Steps

1. Activate Feldon by paying and tapping it, creating a token copy of Atsushi with haste.
2. Activate Krark-Clan Ironworks by sacrificing the Atsushi token, adding .
3. Atsushi dies, triggering itself and Feldon.
4. Resolve the Atsushi trigger, creating three Treasure tokens.
5. Resolve the Feldon trigger, untapping it.
6. Activate a Treasure token by tapping and sacrificing it, adding .
7. Repeat.
8. Once you have infinite mana, you may instead exile cards using Atsushi and cast them from exile this turn.

Results