Twinferno 
Instant
$0.21 #2608 0.21 4.0 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.
Teach by Example95%
$0.09↓#7679↓0.125.4 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Doublecast95%
$0.23↑#11342↓0.138.1 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 Palette93%
$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 Horde93%
$0.27↑#13778↓0.33↑11.9 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Galvanic Iteration93%
$0.27↑#29570.204.9 years
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Double Vision90%
$0.60↑#27300.43↑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."
Swarm Intelligence90%
$0.36↑#4702↓0.37↑9.1 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%
$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."
Cursed Recording90%
$0.27↑#10492↓0.161.9 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."
Dual Strike88%
$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."
Mirari88%
$0.42↑#15206↓0.88↑24.9 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."
Najal, the Storm Runner88%
$0.18↓#12268↓0.33↑4.0 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."
Tzaangor Shaman87%
$0.34↑#15250↓0.31↑3.9 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%
$0.27↑#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."
Storm King's Thunder86%
$2.89↑#5666↓0.294.2 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."
Summon: G.F. Cerberus86%
$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."
Repeated Reverberation86%
$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."
Riku of Two Reflections85%
$5.72↑#12137↓0.47↑15.2 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."
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."
Cloven Casting84%
$0.25↑#22362↓0.58↑17.3 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."