Dark Wings Bring Your Downfall
From Duskmourn: House of Horror Commander set
Dark Wings Bring Your Downfall
Ongoing Scheme
(An ongoing scheme remains face up until it's abandoned.)
Whenever you attack, create a 5/5 black Demon creature token with flying that's tapped and attacking.
At the beginning of each end step, if two or more creatures died under your control this turn, abandon this scheme.