Beat of the Ironsong [SUP251] (Super Slam)

Choose X+1, where X is the number of +1POWER counters on an attacking Dawnblade; Target Dawnblade attack gets +1POWER. Target Dawnblade attack gets go again. Cards defending target Dawnblade attack can't gain DEFENSE. Damage target Dawnblade attack would deal can't be prevented.