Rule 901.1 · Planechase
In the Planechase variant, plane cards and phenomenon cards add additional abilities and randomness to the game. The Planechase variant uses all the normal rules for a Magic game, with the following additions.
Ask the judge Pro
The life counter has an AI judge that answers your play citing the exact rules. It is part of Gatewatch Pro; the rules, Oracle text and rulings stay free.