Zoodiac Thoroughblade [MP17-EN184] Ultra Rare

If this card is Normal or Special Summoned: You can discard 1 "Zoodiac" card, and if you do, draw 1 card. An Xyz Monster whose original Type is Beast-Warrior and has this card as Xyz Material gains this effect.
• If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent.