Armybreaker Dragon

Flying, First Strike, Spiritualize{3}{w}You may pay {3}{w} and tap this creature. If you do, as long as it remains tapped, put an aura counter on it when you end your
turn.)
{3}{w}{w} Remove X Aura counters from this creature: This creature deals X damage to target player and X damage to each creature and Planeswalker he or she controls.