Sequence Spell Card

A Sequence Spell Card (シーケンスカード, Shīkensu Mahō Kādo), also known as just a Sequence Card (シーケンスカード, Shīkensu Kādo) is a sub-type Spell Cards that possess two effects: A regular Spell Card Effect and a Sequence Effect.

Sequence Spell Cards are still classified as any of the regular Spell Card Types (Normal, Quick-Play, and Continuous), though they have a second box above their main effect box, similarly to Pendulum Monsters, that contains its Sequence Effect. The Sequence Effect being only able to be used during a Battle Sequence and their effects only apply to Battle Units in the Battle Zone.

Rulings

 * Activating the Sequence Effect of a Sequence Spell Card is still considered activating a Spell Card, so cards such as " can be activated in response to them, even during a Battle Sequence.