Planar Dice

Each player begins the game with this card in his or her command zone.
{0}: Roll a six-sided die. If you roll a one (Planechase), draw a new card from the plane deck. If you roll a six (Chaos), activate the current plane's Chaos ability. This ability can only be activated at any time you could cast a sorcery, and costs {1} more for each time you've activated this ability this turn. (Its cost resets to {0} at the start of your next turn.)