MTG Keyword Rules — Comprehensive Rules Glossary

A player may planeswalk only during a Planechase game. Only the planar controller may planeswalk. See rule 901, “Planechase.”

To planeswalk is to put each face-up plane card and phenomenon card on the bottom of its owner’s planar deck face down, then move the top card of your planar deck off that planar deck and turn it face up.

A player may planeswalk as the result of the “planeswalking ability” (see rule 901.8), because the owner of a face-up plane card or phenomenon card leaves the game (see rule 901.10), or because a phenomenon’s triggered ability leaves the stack (see rule 704.6f). Abilities may also instruct a player to planeswalk.

The plane card that’s turned face up is the plane the player planeswalks to. The plane card that’s turned face down or that leaves the game is the plane the player planeswalks away from. The same is true with respect to phenomena.