O Forbidden Evil-eye, Open

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