Shield & Tower Shield cost 1 & 5, respectively for 1 & 2 pts of DR. Plus, they only cost a single card each. To match Shield, you're spending 7(okay, 4 for upped); to match Diamond Shield which costs 6 for 3, you're spending 15(9), 3 cards, and one of those could have been used to animate a weapon instead. For 9 pts of DR, you're going to spend 23(14) and 5 cards...and you have to worry about PC and CC both.