Storm King's Thunder 
Instant
$2.89 #5666 0.29 4.2 years
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 similar to Storm King's Thunder 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.
Teach by Example94%
$0.09↓#7679↓0.12↓5.4 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Doublecast94%
$0.23↓#11342↓0.13↓8.1 years↑
"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 Palette90%
$0.15↓#18183↓0.00↓0.4 years↓
"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 Horde90%
$0.27↓#13778↓0.3311.9 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Galvanic Iteration90%
$0.27↓#2957↑0.204.9 years
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Dual Strike86%
$0.25↓#9956↓0.05↓5.6 years↑
"When you next cast an instant or sorcery spell with mana value 4 or less this turn, copy that spell. You may choose new targets for the copy."
Twinferno86%
$0.21↓#2608↑0.214.0 years
"• When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Complete the Circuit86%
$0.27↓#9029↓0.44↑3.4 years
"When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies."
Summon: G.F. Cerberus85%
$0.34↓#7663↓0.261.2 years↓
"Triple — When you next cast an instant or sorcery spell this turn, copy it twice. You may choose new targets for the copies."
Cursed Recording85%
$0.27↓#10492↓0.16↓1.9 years↓
"
: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Chandra, the Firebrand84%
$1.02↓#13852↓0.00↓15.1 years↑
"−2: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Repeated Reverberation84%
$0.36↓#7765↓0.60↑7.2 years↑
"When you next cast an instant spell, cast a sorcery spell, or activate a loyalty ability this turn, copy that spell or ability twice. You may choose new targets for the copies."
Gadwick's First Duel84%
$0.17↓#19767↓0.48↑3.0 years↓
"When you next cast an instant or sorcery spell with mana value 3 or less this turn, copy that spell. You may choose new targets for the copy."
Adaptive Training Post83%
$0.26↓#8440↓0.301.4 years↓
"Remove three charge counters from this artifact: When you next cast an instant or sorcery spell this turn, copy it and you may choose new targets for the copy."
Najal, the Storm Runner82%
$0.18↓#12268↓0.334.0 years
"Whenever this card attacks, you may pay 
. If you do, when you next cast an instant or sorcery spell this turn, copy it. You may choose new targets for the copy."
. If you do, when you next cast an instant or sorcery spell this turn, copy it. You may choose new targets for the copy."
Swarm Intelligence82%
$0.36↓#47020.379.1 years↑
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Double Vision82%
$0.60↓#2730↑0.43↑6.2 years↑
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
The Mirari Conjecture82%
$0.28↓#12765↓0.48↑8.4 years↑
"Until end of turn, whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy."
Bonus Round82%
$3.59↑#47770.218.2 years↑
"Until end of turn, whenever a player casts an instant or sorcery spell, that player copies it and may choose new targets for the copy."
Twincast82%
$6.50↑#62580.00↓21.3 years↑
"Copy target instant or sorcery spell. You may choose new targets for the copy."