Yeah exactly what squiggs said. He's a Suarez clone.
Well, no, he isn't, as I said earlier. Suarez wasn't doing that non stop. Costa is. Suarez resorted to that sort of thuggery when things weren't going his way. Costa resorts to it regardless of how things are going. It's quite shamelessly a chronic part of his game. And refs were on Suarez's case more or less immediately. With Costa it's as if refs have thought, if they judge him properly, they'll send him off every other game, so they just ignore it all.