The Joy of Being a Servant is a Weiß Schwarz card from 転生したらスライムだった件 Vol.3 TSK/S101-024. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Card type
Climax
Side
Schwarz
Color
Yellow
Trigger
Soul Return
Neo-Standard
That Time I Got Reincarnated as a Slime
Card Text
【CONT】 All of your characters get +1000 power and +1 soul.
([[bounce.gif]]: When this card triggers, you may choose 1 of your opponent's characters, and return it to their hand)