Boost 2 (Once during your turn, you may pay 2
to put the top card of your deck facedown under this character.)

EXPEDIENT SCHEMES Whenever this character quests, if you've put a card under her this turn, you may play an action with cost 5 or less from your discard for free, then put that action card on the bottom of your deck instead of into your discard.
Source: Lorcana App