Barbelith

Pay {w},{u},{b},{r}, or {g} to place one token on Barbelith. Barbelith can only hold one of a token from a particular color at a time.
{1}{t}: Gain 1 mana of any color.
Remove 5 tokens from Barbelith: Exile Barbelith. All players shuffle all cards they control and cards in their hand into their library and draw a new starting hand. Begin a new turn.