A Two-Headed Giant Planechase game uses all the rules for the Two-Headed Giant multiplayer variant and all the rules for the Planechase casual variant, with the following additions.
September 30, 2011 · Innistrad
In multiplayer formats other than Grand Melee, plane cards are exempt from the limited range of influence option. Their abilities, and the effects of those abilities, affect all applicable objects and players in the game. (See rule 801, "Limited Range of Influence Option.")
June 17, 2011 · Commander 2011
In multiplayer formats other than Grand Melee, plane cards are exempt from the limited range
April 1, 2011 · Duel Decks: Knights vs. Dragons
In multiplayer formats other than Grand Melee, plane cards are exempt from the limited range of influence option. Their abilities, and the effects of those abilities, affect all applicable objects and players in the game. (See rule 801, "Limited Range of Influence Option.")
February 4, 2011 · Mirrodin Besieged
In multiplayer formats other than Grand Melee, plane cards are exempt from the limited range of influence option. Their abilities, and the effects of those abilities, affect all applicable objects and players in the game. (See rule 801, “Limited Range of Influence Option.”)
October 1, 2010 · Scars of Mirrodin
In multiplayer formats other than Grand Melee, plane cards are exempt from the limited range
February 1, 2010 · Worldwake
In multiplayer formats other than Grand Melee, plane cards are exempt from the limited range of influence option. Their abilities, and the effects of those abilities, affect all applicable objects and players in the game. (See rule 801, "Limited Range of Influence Option.")