Circling Vultures 
Creature — Bird
Flying You may discard this card any time you could cast an instant. At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL