Heroic Challenger - Assault Halberd

[ Warrior / Effect ] If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent. When this card inflicts battle damage to your opponent: You can add 1 "Heroic" card from your Deck to your hand. ATK/ 1800 DEF/ 200