At the end of the game, you must reveal any face-down conspiracies you own in the command zone to all players. Notably, you can't bluff conspiracies with hidden agenda by putting other cards into the command zone face down as the game starts.
Assemble the Rank and Vile
You can look at any player's face-up conspiracies at any time. You'll also know how many face-down conspiracies a player has in the command zone, although you won't know what they are.
A conspiracy with hidden agenda that has a triggered ability must be face up before that ability's trigger condition is met in order for it to trigger. Turning it face up afterward won't have any effect.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Seb McKinnon
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
