Witch Engine + Corpse Dance + Ashnod's Altar

Witch Engine
Corpse Dance
Ashnod's Altar

Corpse Dance in hand. All permanents on the battlefield.
  1. Activate Witch Engine by tapping it, targeting any opponent.
  2. Holding priority, activate Ashnod's Altar by sacrificing Witch Engine, adding cc.
  3. Resolve the Witch Engine ability, adding bbbb and not giving control of Witch Engine to an opponent due to it no longer being on the battlefield.
  4. Cast Corpse Dance with buyback by paying 4b, returning Witch Engine from your graveyard to the battlefield with haste, and returning Corpse Dance to your hand.
  5. Repeat.
Infinite black mana. Infinite colorless mana. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite storm count. Infinite magecraft triggers.