Derevi, Empyrial Tactician

Bird Wizard Food Golem
Flying
Whenever Derevi, Empyrial Tactician enters the battlefield or 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.
{2},{t}, Sacrifice this artifact: You gain 3 life.