Derevi, Empyrial Tactician [Commander 2013] SPWA-EN016 if this card battles an

if this card battles an opponent's monster while this card has a "Utopia" Xyz Monster as Xyz Material: You can detach 2 Xyz Materials from this card

{T}: Return target permanent you both own and control to your hand

Discard all Energy cards attached to Pikachu in order to use this attack

[1WW] Giant Claw (70)

Derevi, Empyrial Tactician [Commander 2013] SPWA-EN016 if this card battles anSet: Commander 2013 Type: Legendary Creature Bird Wizard Rarity: Mythic Cost: {G}{W}{U} 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.