謎の幼獣 is a Weiß Schwarz card from 怪獣８号 KJ8/S123-048. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【ACT】 [Place this underneath a character with "Hibino Kafka" in its name face-up as a Marker] Search your deck for up to 1 character with "Kaiju No. 8" in its name, show it to your opponent, add it to hand, and shuffle your deck afterwards.
This card was printed in Japanese only; the English text above is an unofficial community translation.