Sheogorath, the Mad God

At the beginning of your upkeep, roll a six-sided die. If it comes up -
"1", sacrifice a creature.
"2", target player discards a card at random.
"3", draw a card.
"4", add {w}{u}{b}{r}{g} at the beginning of your next precombat main phase.
"5", exile target creature.
"6", target creature can't be blocked until end of turn.