Crippling Ambush

When you cast Crippling Ambush, shuffle it into target opponent's deck.
When you draw Crippling Ambush, if you aren't its owner, reveal it. Crippling Ambush deals 20 damage to you.
The landscape of Armundra is a sea of spells waiting to be cast, of chaos ready to be unleashed, and of minds ready to be shutdown.