Soul of Silvermountain Super Rare - Return of the Duelist Unlimited

2 Level 3 EARTH monsters // Once per turn: You can detach 1 Xyz Material from this card to target 1 Set card in your opponent's Spell & Trap Card Zone; it cannot be activated while this card is face-up on the field. If this card destroys an opponent's monster by battle while it has Xyz Material: You can target 1 EARTH monster in your Graveyard; Special Summon that target in face-up Defense Position.