first off,ipconfig is right, Crypt requires u to flip a coin everyturn with a 50/50 chance of takeing 3 damage, in a deck designed to run fairly slow a crypt could really hurt you a few turns into the game.
secondly, have u thought about tinker/platinum angel? it gets around moat unlike darksteel, and puts your aponent into quite a predicimant because they not only have to try and get rid of pesky meddling mages, there efforts are worthless if this guy is not delt with fast.