Sleep Mode is a Weiß Schwarz card from 転生したらスライムだった件 Vol.2 TSK/S82-025. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Card type
Event
Side
Schwarz
Color
Yellow
Level
1
Cost
1
Neo-Standard
That Time I Got Reincarnated as a Slime
Card Text
【COUNTER】 If you do not have a 《Demon Continent》 character, this card cannot be played from your hand. Choose 1 of your characters, and that character gets the following ability until end of turn. "【CONT】 This card cannot become 【REVERSE】."