Infinite black manaInfinite colorless manaInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite magecraft triggersInfinite creature sacrifice triggersInfinite storm count
How it works
Activate Witch Engine by tapping it, targeting any opponent.
Holding priority, activate Ashnod's Altar by sacrificing Witch Engine, adding CC.
Resolve the Witch Engine ability, adding and not giving control of Witch Engine to an opponent due to it no longer being on the battlefield.
Cast Corpse Dance with buyback by paying 4, returning Witch Engine from your graveyard to the battlefield with haste, and returning Corpse Dance to your hand.