Mercurial Kite 
Creature — Bird
Flying Whenever this creature deals combat damage to a creature, tap that creature. That creature doesn't untap during its controller's next untap step.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL