Totem Pole
Your opponent cannot target Rock monsters you control with 0 original ATK with card effects. Once per attack, when an opponent's monster declares an attack: You can negate that attack, and if you do, place 1 counter on this card. If this card has 3 counters, send it to the GY. If you have 3 or more Rock monsters with 0 ATK and different names in your GY: You can banish this card from your GY; any effect damage your opponent takes this turn is doubled.