I honestly think the Mummies and Dragons make this deck slower. Also, you have about 10 pillars too many, especially if you take those cards out. If you want to, consider adding Pufferfish as well, as they do poison damage when they hit the opponent. Cut it down to 30 cards, add possibly a Permafrost shield (especially if you take out 10 death pillars and add say 4 water) and you could have a very strong poison deck there.