Storm King's Thunder {X}{R}{R}{R}
Instant
When you next cast an instant or sorcery spell this turn, copy that spell X times. You may choose new targets for the copies.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Complete the Circuit 92%
$0.35#9059
"When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies."
Galvanic Iteration 88%
$0.26#2918
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Pigment Wrangler // Striking Palette 88%
$0.10#18650
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Doublecast 88%
$0.21#11121
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Howl of the Horde 88%
$0.24#13504
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Teach by Example 88%
$0.12#7586
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Thousand-Year Storm 87%
$1.37#1394
"Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies."
Double Vision 87%
$0.60#2668
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Chandra, Hope's Beacon 86%
$2.62#4076
"Whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy. This ability triggers only once each turn."
Sevinne, the Chronoclasm 86%
#19831
"Whenever you cast your first instant or sorcery spell from your graveyard each turn, copy that spell. You may choose new targets for the copy."
Swarm Intelligence 85%
$0.39#4549
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Unbound Flourishing 85%
$2.17#2696
"Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy."
Djinn Illuminatus 83%
$0.32#17031
"Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost."
The Mirari Conjecture 83%
$0.30#12472
"Until end of turn, whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy."
Melek, Izzet Paragon 83%
$0.13#7208
"Whenever you cast an instant or sorcery spell from your library, copy it. You may choose new targets for the copy."
Hive Mind 83%
$9.85#7651
"Whenever a player casts an instant or sorcery spell, each other player copies that spell. Each of those players may choose new targets for their copy."
Orvar, the All-Form 83%
$3.15#5496
"Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents."
Show of Confidence 82%
$0.19#10015
"When you cast this spell, copy it for each other instant and sorcery spell you've cast this turn. You may choose new targets for the copies."
Pyromancer Ascension 81%
$0.28#11771
"Whenever you cast an instant or sorcery spell while this enchantment has two or more quest counters on it, you may copy that spell. You may choose new targets for the copy."
Invasion of Arcavios // Invocation of the Founders 81%
$0.31#10248
"Whenever you cast an instant or sorcery spell from your hand, you may copy that spell. You may choose new targets for the copy."