Call Forth the Tempest is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Cascade, cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order. Then do it again.) Call Forth the Tempest deals damage to each creature your opponents control equal to the total mana value of other spells you've cast this turn.
Complete guide
Call Forth the Tempest is an explosive eight-mana sorcery that embodies the chaotic power of a literal storm. By combining the unpredictable nature of double cascade with a massive wave of area-of-effect damage, it can turn a losing board state into a dominant victory in a single turn.
Dual Cascades and Mana Values
When you cast Call Forth the Tempest, its two Cascade abilities trigger separately. You will exile cards from your library until you find a nonland card with a mana value less than 8. After you cast that spell, the second Cascade trigger resolves, looking for another card with a mana value less than 8. It is important to remember that 'mana value' is always based on the printed mana cost in the corner of the card; ignore any discounts or additional costs paid during the turn.
Step-by-Step Resolution
First, you cast Call Forth the Tempest, putting it on the stack. Next, the two Cascade triggers are placed on top of it. The first Cascade resolves: you exile cards, find a spell, and cast it. That new spell goes on top of the stack and resolves completely. Then, the second Cascade resolves: you exile more cards, find a second spell, and cast it. That second spell resolves. Finally, Call Forth the Tempest itself resolves, checking how many other spells you cast this turn to determine its damage.
Calculating the Damage
The damage dealt by Call Forth the Tempest is calculated only when the spell finally resolves. It counts the mana value of every other spell you cast that turn, regardless of whether those spells resolved, were countered, or were cast via the Cascade triggers. If you cast a cheap spell earlier in the turn and then hit two high-cost spells with Cascade, the total damage can easily exceed 15 or 20, wiping out even the largest creatures your opponents control.
Strategic Timing
Because this spell relies on the 'total mana value' of other spells, you should aim to play it after casting at least one other spell from your hand if possible. However, even if it is the first spell you cast from your hand, the two spells found via Cascade will contribute their mana values to the damage calculation, ensuring it rarely deals zero damage.
Interaction examples
All Is DustIf your first Cascade trigger hits All Is Dust, you cast it for free. All Is Dust has a mana value of 7, which is less than 8. Once All Is Dust resolves, Call Forth the Tempest will count that 7 toward its damage total, even though you didn't pay any mana for the Eldrazi spell.
Blasphemous ActSuppose you cast Blasphemous Act earlier in the turn for only one red mana because there were twelve creatures on board. When Call Forth the Tempest resolves later that turn, it counts the full mana value of Blasphemous Act, which is 9, not the 1 mana you actually spent. This significantly boosts the Tempest's damage output.
If you cast Call Forth the Tempest and Cascade into All Is Dust, then Cascade into a different spell, you count the mana value of All Is Dust (7) plus the other spell. If you had previously cast Blasphemous Act from your hand, its mana value (9) is also added. The Tempest will then deal the sum of those values to each creature your opponents control.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Call Forth the Tempest
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
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.
No other card is named in this ruling.
- #2· Wizards of the Coast
If the card has
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.No other card is named in this ruling.
- #3· Wizards of the Coast
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.
No other card is named in this ruling.
- #4· Wizards of the Coast
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
No other card is named in this ruling.
- #5· Wizards of the Coast
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.
No other card is named in this ruling.
- #6· Wizards of the Coast
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.
No other card is named in this ruling.
- #7· Wizards of the Coast
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.
No other card is named in this ruling.
- #8· Wizards of the Coast
You exile the cards face up. All players will be able to see them.
No other card is named in this ruling.
- #9· Wizards of the Coast
If a spell with cascade is countered, the cascade ability will still resolve normally.
No other card is named in this ruling.
- #10· Wizards of the Coast
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.
No other card is named in this ruling.
- #11· Wizards of the Coast
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.
No other card is named in this ruling.
Legal formats
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Meta decks with Call Forth the Tempest
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