Historical Rules · 10 August 2018
Rule 312.6
Official source text from the 10 August 2018 Rules release
If a non-ongoing scheme card is face up in the command zone, and no triggered abilities of any scheme are on the stack or waiting to be put on the stack, that scheme card is turned face down and put on the bottom of its owner’s scheme deck the next time a player would receive priority. (This is a state-based action. See rule 704.)