The Fourth Primogenitor and The Observer is a Weiß Schwarz card from 電撃文庫 Gsb/WS02-150. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Card type
Climax
Side
Weiß / Schwarz
Color
Blue
Trigger
Soul Gate
Neo-Standard
Dengeki Bunko
Card Text
【CONT】 All of your characters get +1000 power and +1 soul.
([[gate.gif]]: When this card triggers, you may choose 1 climax in your waiting room, and return it to your hand)