Cascade Spell Card

Cascade Spell Cards, known as Cascade Magic Cards (Japanese: カスケード魔法カード Kasukēdo Mahō Kādo) in the OCG, are a type of Spell Card used to Cascade Summon Cascade Monsters. Unlike other types of Spell Cards, which reside in the Main Deck, Cascade Spell Cards are stored in the Extra Deck. Like Quick-Play Spell Cards, Cascade Spell Cards are Spell Speed 2. Their symbol resembles the Bohr model of the atom.

Before a Cascade Spell Card can be activated, it must first be cached from the Extra Deck. To cache a Cascade Spell Card from the Extra Deck, the player must follow the requirements listed on that Cascade Spell Card's card text. Once this is done, the Cascade Spell Card is placed sideways face-up in an unoccupied Spell & Trap Zone, similar to Monster Cards placed in Defense Position. While a Cascade Spell Card is cached, its effects are not applied; however, it can still be targeted, destroyed, or otherwise affected by the effects of cards like "Mystical Space Typhoon".

A Cascade Spell Card is activated as part of a Cascade Summon. When a player performs a Cascade Summon, they first turn the Cascade Spell Card they intend to use in vertical position, indicating that they are activating it. If the activation of the Cascade Spell Card is successful, the player can then use two or more monsters with consecutive Levels they control as Cascade Materials to Cascade Summon a Cascade Monster from their Extra Deck, whose Class is approached by (from above or below) or equal to one of the Levels of the Cascade Materials. If all of the Cascade Materials used in the Cascade Summon have a lower Level than the Summoned monster's Class, the Cascade Spell Card is sent to the Graveyard. Cascade Materials that have a Level higher than the Summoned Cascade Monster's Class are then attached to the Cascade Spell Card as materials, similar to Xyz Materials for Xyz Monsters. If the Cascade Spell Card was not sent to the Graveyard, the effects of the Cascade Spell Card are now applied, and the card remains face-up on the field, similar to Continuous, Equip, and Field Spell Cards, as well as Pendulum Monsters treated as Spell Cards in the Pendulum Zone.

If the player controls an activated Cascade Spell Card with materials, they can follow the same requirements used to cache it from the Extra Deck to Special Summon one of those materials to their field. A Special Summon from a Cascade Spell Card is treated as being Special Summoned by a card effect, and thus starts a Chain. This also means that Special Summons from Cascade Spell Cards cannot be negated by cards like "Thunder King Rai-Oh", but can be negated by cards that negate the activations of card effects, like "Solemn Warning". If a Cascade Spell Card with materials attached leaves the field, or is put back into its cached state by a card effect, its materials are sent to the Graveyard.

Cascade Spell Card reservation and Special Summon requirements can be either in response to a condition being filled, similar to an activation requirement, or by the player paying a Cost.

For every Cascade Monster a player has in their Extra Deck, the player may run a Cascade Spell Card in their Extra Deck without regards to the 15-card size limit, for a maximum of 30 cards in the Extra Deck if the player runs 15 Cascade Monsters and 15 Cascade Spell Cards. If the number of Cascade Spells in the Extra Deck exceeds the amount of Cascade Monsters, the surplus Cascade Spell Cards will count towards the Extra Deck limit as normal. For example, if a player has 5 Cascade Monsters and 7 Cascade Spell Cards in their Extra Deck, then they will have used up 7 cards in their Extra Deck; 5 from the Cascade Monsters, and 2 from the excess amount of Cascade Spell Cards (the other 5 Cascade Spell Cards are not counted).

Playing Style
Since Cascade Spell Cards can be used from the Extra Deck, they are easier to use than the similar Ritual Spell Cards, as they do not have to be searched. Many Cascade Spell Cards have fairly straightforward requirements for caching and Special Summoning their materials, though some have more difficult requirements which are made up for with more powerful effects once activated.