Dark Wings Bring Your Downfall

(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.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ocen08kfppb1h7ufr8806.