Add highlight for opponents actions

In Magic the Gathering: Arena there is a white border around cards the opponent is currently highlighting (e.g. reading a specific creature)

It would be nice to have a similar feature in Omega. In RL (and DB) you also see if your opponent is checking his/your GY, his/your banished pile etc. A simple white border around the card in focus (by mouseover/touch) would be enough imo