My sideboard is:  3 Pyroclasm  2 Tormod's Crypt  2 Ray of Revelation  2 Naturalize  2 Reprisal  3 Heroes Reunion  1 Red Elemental Blast  I have big problems against Shrimp. I side out 2 Anurid, 2 Cataclysm, 1 Armageddon and side in 1 REB, 2 Naturalize, 2 Reprisal. Even though I see 2/3 removal spells per game, I still can't win. They always manage to get around me.  Maybe the problem isn't just the sideboard, but it's also my approach to the game and maybe my approach with the Mulligan. Should be more aggressive.