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Cascade

Subtypes of each card type except creature and plane are always single words and are listed after a long dash. Each word after the dash is a separate subtype. Subtypes of creature cards are one or two words and are listed after a long dash. Each word or two-word phrase, as listed in rule 205.3m, is a separate subtype. Objects other than planes may have multiple subtypes. Subtypes of planes are also listed after a long dash, but may be multiple words; all words after the dash are, collectively, a single subtype.

One card (Apocalypse Chime) refers to permanents with a name originally printed in the Homelands™ expansion. Those names are Abbey Gargoyles; Abbey Matron; Aether Storm; Aliban’s Tower; Ambush; Ambush Party; Anaba Ancestor; Anaba Bodyguard; Anaba Shaman; Anaba Spirit Crafter; An-Havva Constable; An-Havva Inn; An-Havva Township; An-Zerrin Ruins; Apocalypse Chime; Autumn Willow; Aysen Abbey; Aysen Bureaucrats; Aysen Crusader; Aysen Highway; Baki’s Curse; Baron Sengir; Beast Walkers; Black Carriage; Broken Visage; Carapace; Castle Sengir; Cemetery Gate; Chain Stasis; Chandler; Clockwork Gnomes; Clockwork Steed; Clockwork Swarm; Coral Reef; Dark Maze; Daughter of Autumn; Death Speakers; Didgeridoo; Drudge Spell; Dry Spell; Dwarven Pony; Dwarven Sea Clan; Dwarven Trader; Ebony Rhino; Eron the Relentless; Evaporate; Faerie Noble; Feast of the Unicorn; Feroz’s Ban; Folk of An-Havva; Forget; Funeral March; Ghost Hounds; Giant Albatross; Giant Oyster; Grandmother Sengir; Greater Werewolf; Hazduhr the Abbot; Headstone; Heart Wolf; Hungry Mist; Ihsan’s Shade; Irini Sengir; Ironclaw Curse; Jinx; Joven; Joven’s Ferrets; Joven’s Tools; Koskun Falls; Koskun Keep; Labyrinth Minotaur; Leaping Lizard; Leeches; Mammoth Harness; Marjhan; Memory Lapse; Merchant Scroll; Mesa Falcon; Mystic Decree; Narwhal; Orcish Mine; Primal Order; Prophecy; Rashka the Slayer; Reef Pirates; Renewal; Retribution; Reveka, Wizard Savant; Root Spider; Roots; Roterothopter; Rysorian Badger; Samite Alchemist; Sea Sprite; Sea Troll; Sengir Autocrat; Sengir Bats; Serra Aviary; Serra Bestiary; Serra Inquisitors; Serra Paladin; Serrated Arrows; Shrink; Soraya the Falconer; Spectral Bears; Timmerian Fiends; Torture; Trade Caravan; Truce; Veldrane of Sengir; Wall of Kelp; Willow Faerie; Willow Priestess; Winter Sky; and Wizards’ School.

Artifact subtypes are always a single word and are listed after a long dash: “Artifact — Equipment.” Artifact subtypes are also called artifact types. Artifacts may have multiple subtypes. See rule 205.3g for the complete list of artifact types.

Creature subtypes are usually a single word long and are listed after a long dash: “Creature — Human Soldier,” “Artifact Creature — Golem,” and so on. Creature subtypes are also called creature types. Creatures may have multiple subtypes. See rule 205.3m for the complete list of creature types.

Storm is a triggered ability that functions on the stack. “Storm” means “When you cast this spell, copy it for each other spell that was cast before it this turn. If the spell has any targets, you may choose new targets for any of the copies.”

Enchantment subtypes are always a single word and are listed after a long dash: “Enchantment — Shrine.” Each word after the dash is a separate subtype. Enchantment subtypes are also called enchantment types. Enchantments may have multiple subtypes. See rule 205.3h for the complete list of enchantment types.

Instant subtypes are always a single word and are listed after a long dash: “Instant — Arcane.” Each word after the dash is a separate subtype. The set of instant subtypes is the same as the set of sorcery subtypes; these subtypes are called spell types. Instants may have multiple subtypes. See rule 205.3k for the complete list of spell types.

You exile the cards face up. All players will be able to see them.

When the cascade ability resolves, you must exile cards. The only optional part of the ability is whether or not you cast the last card exiled.

Count the mana values of all other spells you've cast this turn before Call Forth the Tempest resolved, including any spells that you've cast due to Call Forth the Tempest's cascade abilities. It doesn't matter whether those spells resolved; you only need to have cast them. Conversely, if you copy a spell without casting it, you won't include that copy's mana value in the amount of damage Call Forth the Tempest deals.

Due to a 2021 rules change to cascade, not only do you stop exiling cards if you exile a nonland card with lesser mana value than the spell with cascade, but the resulting spell you cast must also have lesser mana value. Previously, in cases where a card's mana value differed from the resulting spell, such as with some modal double-faced cards or cards with an Adventure, you could cast a spell with a higher mana value than the exiled card.

If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast the card.

If a spell with cascade is countered, the cascade ability will still resolve normally.

No matter what spell you cast with the first cascade ability (or with any cascade abilities that result from casting that spell), the second cascade ability will look for a card with mana value less than Call Forth the Tempest's mana value of 8.

Cascade triggers when you cast the spell, meaning that it resolves before that spell. If you end up casting the exiled card, it will go on the stack above the spell with cascade.

If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

Each instance of cascade triggers and resolves separately. The spell you cast due to the first cascade ability will go on the stack on top of the second cascade ability. That spell will resolve before you exile cards for the second cascade ability.

A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.