Rule 901.7 · Planechase

Any abilities of a face-up plane card or phenomenon card in the command zone function from that zone. The card’s static abilities affect the game, its triggered abilities may trigger, and its activated abilities may be activated.

Subrules

A face-up plane card or phenomenon card that’s turned face down becomes a new object.

Other rules in this chapter

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.