You Shall Not Pass

You may exile target creature you control. If a creature you control is exiled this way, exile
target creature an opponent controls.
You and permanents you control gain hexproof
and indestructible until end of turn.
"I am a servant of the Secret Fire, wielder of the flame
of Anor. You cannot pass. The dark fire will not
avail you, flame of Udun. Go back to the Shadow!"
—Gandalf the Grey