Twilight Colossus

Flying, Trample
When Twilight Colossus attacks, destroy up
to one target Artifact or Enchantment.
You may exert Twilight Colossus as it attacks.
When you do, exile target nonland permanent.
Then, at the end of combat, transform Twilight
Colossus. (An exerted creature won't untap
during your next untap step.)