Bahamut ZERO

Flying, Indestructible
Destroy all other permanents with mana cost of the first X or less
Create X 6/6 colorless artifact dragon creature tokens with flying and hexproof, where X is the second X in the mana cost
{x}{t}: This creature does X damage to target creature or player, where X is less the fifteen
{x}{x}: Create a X/X dragon creature token with flying