Derevi, Empyrial Tactician 
Legendary Creature — Bird Wizard
Flying
When Derevi enters and whenever a creature you control deals combat damage to a player, you may tap or untap target permanent.
: Put Derevi onto the battlefield from the command zone.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL