Defense of the Gatewatch

When Defense of the Gatewatch enters the battlefield, you may search your library for a planeswalker card, reveal it, put it into your hand, then shuffle your library.
Whenever a planeswalker enters the battlefield under your control, put a loyalty counter on it, scry 2, create a tapped 2/2 black Zombie creature token, and add one mana of any color to your mana pool. Defense of the Gatewatch deals 2 damage to each opponent.