War Rock Ordeal

You can only control 1 "War Rock Ordeal". When this card is activated: Place 3 counters on it. When your "War Rock" monster destroys an opponent's monster by battle and sends it to their GY: You can remove 1 counter from this card, and if you do, draw 1 card. If the last counter has been removed by this effect, send this card to the GY.