Gandalf the Greyhame

You shall not pass!—Whenever a creature with power 5 or greater attacks you, destroy it.
Keep it secret, keep it safe—{t}, Put a shock counter on Gandalf: Target noncreature permanent phases out.
Fly, you fools!—Exile Gandalf the Greyhame and discard a card: Exile target creature, you can't be attacked until your next turn.