Agron, Whirlwind Tempest

Flying, Vigilance, Ward - Tap three creatures

Agron, Whirlwind Tempest costs {x} less to cast where X is the number of tapped creatures your opponents control.

When a creature an opponent controls becomes the target of a spell or ability, tap it.

{4}{w}{w}, {ut}, Sacrifice Agron, Whirlwind Tempest: Destroy all tapped creatures.