* This card is good for can be [[Searcher|searched]] by "[[Dark MagicianRogue of Endymion]]", "[[Watch Cat]]" decks, since you can use powerful effects like "[[Diffusion Wave-MotionWatch Dog]]" and , "[[Dark Magic CurtainThe Despair Uranus]]" without having to pay any , and other [[Life PointsList of generic searchers#Spells|generic searchers]].

* A combo This card is good for "[[Dark Magician]]" Decks, since you can be made use powerful effects like "[[Diffusion Wave-Motion]]" and "[[Dark Magic Curtain]]" without having to pay any [[Life Points]]. * Combo with this card, "[[Abyssal Designator]]" and first, then "[[Autonomous Action Unit]]". ==List== * [[Spell Card]]s that require paying Life Points when activated: (Note that cards that use the amount of LP paid as part of their effect, such as "[[Star Blast]]" and "[[Psychic Blade]]", cannot be activated while "Spell Economics" is on the field.) {{Card query|[[Card type::Spell Card]] [[LP::Pays Life Points for cost]]|medium=official}}