I’m really not sure about server lag issues in implementing this, because I don’t know what the database structure looks like. I guess the simplest thing would be to just add a time counter for the last card played, and check if more than 10 minutes have pbumed since then whenever you try to play a card. Or maybe a timer similar to the ones we have now, “5 minutes 21 seconds until you can play a Domination Card” or something.