Avizandum, Dragon King

Flying, Menace
When Avizandum, Dragon King enters the
battlefield, tap all creatures with lesser power
your opponents control. Those creatures do not
untap during their controller's next untap step.
{x}{x}{r/g}{u},{t}: Tap each creature your opponents
control. Avizandum, Dragon King deals X
damage to all tapped creatures.
"Ah, so that was his name. We simply knew him as
Thunder." -Lord Viren