I think there needs to be a yellow card + sin bin for cynical fouls that break up attacking play. Nothing more frustrating than the commentator saying "he's taken one for the team' or 'that was a good foul', by the end of the game everyone in the back four has a yellow as any chance of an attack where the defence is outnumbered is wrecked by what amounts to a professional foul.
Ruins the spectacle for the neutral completely.