All 51 Combos with Atsushi, the Blazing Sky

Atsushi, the Blazing Sky + Nim Deathmantle + Ashnod's Altar

Infinite Mana: Infinite colored mana, Infinite colorless mana, Infinite death triggers, Infinite ETB, Infinite LTB, Infinite sacrifice triggers, Infinite Treasure tokens, Cast all spells in your library

Activate Ashnod's Altar by sacrificing Atsushi, adding {C}{C}. Atsushi dies, triggering itself and Nim Deathmantle. Resolve the Atsushi trigger, creating three Treasure tokens. Activate two of the Treasure tokens by tapping and sacrificing them, adding {2}. Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Atsushi from your graveyard to the battlefield, and then attach Nim Deathmantle to it. Repeat.