Planechase is a supplemental set for Magic: The Gathering multiplayer games. The set introduced the Planechase format and the associated oversized plane cards. The set was released on September 4, 2009, with release events held on September 4–6.
Planechase consists of four "game packs", each containing ten oversized plane cards, a 60-card deck, a six-sided planar die and a strategy insert with multiplayer rules. The MSRP for an individual pack is $19.99.
The plane cards represent specific locations on planes in the Magic storyline, introducing "a groundbreaking new way to experience planeswalking". The theme decks are tournament legal and each contains eight rares. Additionally, there was a different preview card from the upcoming Zendikar set in each of the four decks (Beast Hunt, Hideous End, Kor Sanctifiers and Whiplash Trap).