Spell Monsters are a type of Continuous Spell Card that is Special Summoned as a Monster Card after it is activated. All of these cards are treated as both Monster Cards and Spell Cards while they are summoned to the field, and as such, take up both a Monster Card Zone and a Spell & Trap Card Zone at the same time. Spell Monsters cannot be activated on your opponent's turn, making them unable to perform the "Emergency" Defense that Trap Monsters can. They can instead provide an immediate source of Tribute Fodder, much like some cards do already, like "Fiend's Sanctuary".