If you rip a plot in one game you must continue the tournament with 1 less card. If you want to check in a deck with only 50 cards and a plot you have to have a secondary deck to play just in case or else not use it. In fact, I'm not entirely sure if it's legal to use a 50 (or other deck minimum with your LS amount) with Plot in it but perhaps someone else can chime in. As far as T2 goes, you have to take out a good card as well in order to make sure your deck is still legal.