Planechase Anthology-Planar Die 

Planechase is a game variant that emphasizes your role as a planeswalker. The game mode uses oversized planar cards that represent specific places within a plane.

This game mode also uses a planar die. This die has four blank faces, one with a chaos symbol, and one with a planeswalker one. You can roll the planar die during your turn and any time you could cast a sorcery. The first roll is free, and each next roll costs one extra mana. The first roll costs 0, the second costs 1, the third costs 2, and so on.

If the roll falls on the planeswalker symbol you simply planeswalk away onto the next plane. If it lands on the chaos one, chaos ensues and the current plane’s chaos ability (the second ability on the card) activates.