Planechase (format)

Planechase, also known as Planar Magic, is an official game variant first populated by Planechase and basically acts as an augmentation to other formats though players can also play decks specifically geared towards this format.

Description
In addition to their normal deck, each player has a deck of at least ten plane or phenomenon cards. A deck can have at most two phenomenon cards. This is called the planar deck, which exists in the command zone. No two plane or phenomenon cards in a planar deck may have the same name.

At the beginning of the game (after mulligans have been taken), the starting player turns the top card of their planar deck face up and its effects become present in the game. There will always be exactly one plane card face up in the command zone. At the beginning of each player's turn, that player gains control of the plane card in the command zone and is known as the planar controller.

Any time a player could cast a sorcery, they may roll the planar die. This die has four blank sides which have no effect. One side has the planeswalker symbol  on it. When the planeswalker symbol is rolled, the planar controller puts the active plane or phenomenon card at the bottom of its owner's planar deck. Then the player who rolled the planeswalker symbol turns the top card of their planar deck face up. This process is known as the planeswalking ability. The final side of the planar die shows the chaos symbol which triggers the chaos ability of the active plane card. The chaos ability then goes on the stack and the active player gets priority.

Rolling the planar die costs an amount of mana equal to the number of times the player taking that action has done so that turn. For example, the first die roll costs, the second costs , and so on.

Leaving the game
If the planar controller would leave the game, instead the next player in turn order that wouldn't leave the game becomes the planar controller, then the old planar controller leaves the game. If the owner of the active plane leaves the game, the next player in turn order (the new planar controller) turns the top card of their planar deck face up.

Rules
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Planeswalk
The act of moving from one plane to another.