海魔
Sea Monster is a Weiß Schwarz card from Fate/Zero FZ/S17-098. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Choose a character in your hand, and put it into your memory face down. Your opponent chooses the number 2 or 3. Reveal the face down card, and if that card is a character of a level that matches the number that your opponent chose, put it on any position of your stage. If it is not, put that card into your waiting room.