O Forbidden Evil-eye, Open

Play this with 3 if you have a "Demon Stealth Dragon, Shiranui "Oboro"" crest! Choose a unit card with "Stealth" in its card name without sentinel from your drop, and call it to . :When this card is discarded from hand while paying the cost for , choose one of your vanguards or hearts, and until end of turn, reduce the next cost you pay for that card's abilities by ①.