Anzul, Disciple of the Vast

Call to Serve-When your commander deals combat damage to a player, you may put this card onto
the battlefield from outside the game. When it leaves the battlefield, remove it from the game.
Lieutenant-As long as you control your commander, Anzul, Disciple of the Vast gains
"{t},{w}{b}{r}: Search your library for target Angel, Demon, or Dragon card, reveal it, and put it into your hand. You may only activate this ability during your postcombat main phase."