Twinferno 
Instant
$0.23 #2654 0.16 4.1 years
Choose one —
• When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
• Target creature you control gains double strike until end of turn. (It deals both first-strike and regular combat damage.)
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Cards similar to Twinferno 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.
Doublecast95%
$0.23#11583↓0.258.3 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Teach by Example95%
$0.12↓#7736↓0.28↑5.5 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 Palette94%
$0.28↑#14667↓0.070.5 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 Horde93%
$0.26↑#13982↓0.36↑12.1 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Galvanic Iteration92%
$0.26↑#30010.38↑5.1 years
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Double Vision90%
$0.54↑#27920.39↑6.3 years↑
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Swarm Intelligence90%
$0.36↑#4855↓0.42↑9.3 years↑
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Chandra, the Firebrand90%
$0.82↑#13960↓0.1115.3 years↑
"−2: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Cursed Recording90%
$0.24↑#10634↓0.31↑2.1 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."
Mirari88%
$0.42↑#15449↓0.38↑25.1 years↑
"Whenever you cast an instant or sorcery spell, you may pay 
. If you do, copy that spell. You may choose new targets for the copy."
. If you do, copy that spell. You may choose new targets for the copy."
Dual Strike88%
$0.20↓#10156↓0.125.7 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."
Najal, the Storm Runner88%
$0.15↓#12586↓0.174.1 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."
Storm King's Thunder87%
$3.25↑#5765↓0.244.4 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."
Tzaangor Shaman87%
$0.41↑#15585↓0.26↑4.0 years
"Whenever this creature deals combat damage to a player, copy the next instant or sorcery spell you cast this turn when you cast it. You may choose new targets for the copy."
Complete the Circuit86%
$0.20↓#9108↓0.203.5 years
"When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies."
Repeated Reverberation86%
$0.34↑#7757↓0.31↑7.3 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."
Summon: G.F. Cerberus86%
$0.30↑#7564↓0.75↑1.4 years↓
"Triple — When you next cast an instant or sorcery spell this turn, copy it twice. You may choose new targets for the copies."
Gadwick's First Duel85%
$0.19↓#20108↓0.00↓3.1 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."
Riku of Two Reflections85%
$5.55↑#12385↓0.26↑15.3 years↑
"Whenever you cast an instant or sorcery spell, you may pay 
. If you do, copy that spell. You may choose new targets for the copy."
. If you do, copy that spell. You may choose new targets for the copy."
Cloven Casting85%
$0.25↑#22670↓0.43↑17.5 years↑
"Whenever you cast a multicolored instant or sorcery spell, you may pay . If you do, copy that spell. You may choose new targets for the copy."
. If you do, copy that spell. You may choose new targets for the copy."