The Swallowtail Bracers card has two powers - "Reveal this card to add 1 to your non-combat check." and "When a character at your location plays a boon that has the Desna trait on a check, recharge this card to add 1 die to that check."
Question that came up during our game: Since the bracers have the Desna trait, can you use the first power on your non-combat check, then have that trigger the second power and recharge the bracers to also get another die?
Possibly-relevant quotes from the WotR rulebook:
"When a card has multiple powers, you must choose one of them ... If a power says it may be used when something happens, you may use it every time that happens. Otherwise, a specific card's power may only be used once per check or step." (page 9)
"Each player may play no more than 1 card of each type during each step" of an encounter. (page 10)
"Remember that each player may not play more than 1 card of each type or use any 1 power more than once during each check, other than cards that can be used each time something particular happens." (page 12)
Page 12 sounds like it means that the "when" power on the bracers can be triggered by the "reveal this card" power ... is that accurate?
Even if you can use both powers of the bracers on the same check, is there an official ruling on whether playing the same card twice, using different powers, counts as playing two cards of the same type (meaning it's forbidden unless one of the powers is a "when" ability)? For instance, if a card said "Reveal this card to add 1 to your Strength check" and "Discard this card to add 1 to your combat check", could you reveal and then discard it to add 2 to your combat Strength check? I don't know of any card that could actually be used this way; just curious.