Damocles Sky Fortress

When cast, it gains X strength equal to the
number of mana used to cast it. All your
nonlegendary creatures receive +0/+X counter
where X equal to the number of extra mana
used to cast this.
{x}{r}{r}{b}{b}: Fire a FLEIAJ warhead at target
opponent where X is the total damage dealt to
that opponent's creatures. Any excess damage
hits your opponent.
{4}: Equip to a Legendary Creature.
Shroud, Hexproof.