Could anyone tell me why the follow mulligan rules would cause NullRoutine? By everything I can tell it looks like it should work. Code: _mulliganRules.Add(new Tuple<string, string>("True", "card.Entity.Cost >= 0 and card.Entity.Id != \"GVG_058\" and card.Entity.Id != \"FP1_002\" and card.Entity.Id != \"CS2_082\" and card.Entity.Id != \"EX1_080\" and card.Entity.Id != \"AT_079\" and card.Entity.Id != \"GVG_061\""));