My Undead Horde Awakens

(An ongoing scheme remains face up until it's abandoned.) At the beginning of your end step, you may put target creature card from an opponent's graveyard onto the battlefield under your control. When a creature put onto the battlefield with this scheme dies, abandon this scheme.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o4vze2frvpb1h01jsjs0a.