Derevi, Empyrial Tactician is a mythic Legendary Creature — Bird Wizard card from Commander 2013 (C13), collector number 186. Current market price: $7.07, TCGplayer market prices via Scryfall.
Flying When Derevi enters and whenever a creature you control deals combat damage to a player, you may tap or untap target permanent. {1}{G}{W}{U}: Put Derevi onto the battlefield from the command zone.