Scrap Fist

Target 1 "Junk Warrior" you control; if it battles an opponent's monster this turn while you control it, apply these effects. ● Your opponent cannot activate cards or effects until the end of the Damage Step. ● If it attacks a Defense Position monster, inflict piercing battle damage to your opponent. ● Double any battle damage your opponent takes. ● It cannot be destroyed by battle. ● Destroy the opponent's monster that battled it at the end of the Damage Step.