Corpse Dance with buyback by paying ({2} magic symbol) ({B} magic symbol) due to
Blood Funnel.
Blood Funnel triggers, causing you to sacrifice
Witch Engine.
Resolve
Corpse Dance, returning
Witch Engine from your graveyard to the battlefield, giving it haste, and returning
Corpse Dance to your hand.
Resolve the
Witch Engine ability from step 1, adding ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) and failing to give an opponent control of
Witch Engine as it is a new object.
Repeat.
Results
Infinite black mana.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite sacrifice triggers.
Infinite storm count.
Metadata
In 6 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).