A Collaborative Work is a Weiß Schwarz card from 冴えない彼女の育てかた♭ SHS/W71-077. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Card type
Event
Side
Weiß
Color
Red
Level
2
Cost
0
Neo-Standard
Saekano: How to Raise a Boring Girlfriend
Card Text
【COUNTER】 If you do not have a character with "Utaha(詩羽)" in its card name, this card cannot be played from your hand.
Choose 1 of your 《Game》 characters, that character gets +2000 power until end of turn, choose 1 of your opponent's characters, and that character gets -1 soul until end of turn.