Number 138: Bombtails-The-Fox

here's the effect, if you can't read the card effects :
Once per turn, during either player's turn : you can detach 1 Xyz material, then target 1 Face-up Attack monster you control; until the end phase it cannot be destroyed by battle or by card effect, it gains 1000 ATK, is unaffected by card effect and if destroy a monster by battle your opponent discard 1 card. This card cannot attack if you use this effect. If this card is attacked while it has no xyz materials: destroy this monster, also inflict 200 damage to your opponent for each cards in your hand.