Card Rulings in the Rulebook

Kwisatz Haderach lets you take an Agent turn with an agent already on the board, even with none left, and it may go back to the same space; it can't break a once-per-game limit or get past The Voice. Calculated Hire takes the Mentat only from its board space. With Demand Respect, take spice won in the conflict first, then you may use it to pay. Test of Humanity: opponents choose in turn from your left, must pick an option they can do, and pick their own discard. You can't look at the top card of an empty deck.