Historical Rules · 27 September 2013
Rule 310.7
Official source text from the 27 September 2013 Rules release
If a phenomenon card is face up in the command zone, and it isn't the source of a triggered ability that has triggered but not yet left the stack, the planar controller planeswalks the next time a player would receive priority. (This is a state-based action; see rule 704. See also rule 701.21, "Planeswalk.")