It's all the same principle- we are forgetful as humans, and mistakes will be made. It is your responsibility to know all the cards and what happens. If you miss the window of opportunity, you can't go back on it. BTW, Deco is right about Lat Dmg- It goes into a shade of grey argument- do you have the moral right to take damage if your opponent forgets, and vice versa? That's up to you as a player. In fun games, I remind my partner and he reminds me so we can get more used to our decks. In tourney games when playing each other we don't remind our opponent of anything. That being said, if you make yourself "forget" to take Court Damage, and are not reminded by opponent, you are only cheating yourself and making yourself less of a player.