(1) Your opponent cannot target Rock monsters you control with 0 original ATK with card effects.
(2) Once per battle, when an opponent’s monster declares an attack: You can negate that attack, then place 1 counter on this card.
(3) If this card has 3 counters, send it to the GY.
(4) If you have 3 or more 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.