One problem here is it looks like Fosh's reverse card was not yellow, but green. If you're going to be mixing rules, I think you might be required to follow the rules of at least one of the two ...

Longtime Premier League and FIFA referee Mark Clattenburg went to issue Max Fosh a yellow card, and Fosh responded by pulling out a green reverse card from Uno, a card game marketed by Mattel.

Trending YouTube star Max Fosh answers soccer referee’s yellow card with Uno reverse card By Bob D'Angelo, Cox Media Group National Content Desk September 11, 2023 at 8:39 pm EDT + Caption ...

However, the card can only be played on a matching color or on another reverse card. “He’s Uno-reversed him,” one of the match’s broadcasters said. “That’s a first.” ...