Plargg, Dean of Chaos

Plargg, Dean of Chaos (1R) is a legendary 2/2 Orc Shaman that can tap to discard a card and draw a card, and has "4R, T: Reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. Cast it without paying its mana cost and put the rest on the bottom of your library in a random order." Excellent Prismari commander providing both card selection and free spell casting.