Teach by Example 
Instant
$0.12 #7736 0.28 5.5 years
( can be paid with either 
or 
.)
can be paid with either or .)When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
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Cards similar to Teach by Example 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.
Doublecast100%
$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."
Pigment Wrangler // Striking Palette98%
$0.28↑#14667↓0.07↓0.5 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 Horde98%
$0.26↑#13982↓0.3612.1 years↑
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Galvanic Iteration97%
$0.26↑#3001↑0.385.1 years
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Twinferno95%
$0.23↑#2654↑0.16↓4.1 years↓
"• When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Storm King's Thunder94%
$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."
Complete the Circuit94%
$0.20↑#91080.203.5 years↓
"When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies."
Dual Strike94%
$0.20↑#10156↓0.12↓5.7 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."
Cursed Recording94%
$0.24↑#10634↓0.312.1 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."
Chandra, the Firebrand93%
$0.82↑#13960↓0.11↓15.3 years↑
"−2: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Gadwick's First Duel92%
$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."
Summon: G.F. Cerberus92%
$0.30↑#75640.75↑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."
Repeated Reverberation92%
$0.34↑#77570.317.3 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."
Adaptive Training Post91%
$0.23↑#83050.18↓1.5 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 Runner90%
$0.15↑#12586↓0.17↓4.1 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."
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."
The Mirari Conjecture90%
$0.24↑#13028↓0.258.5 years↑
"Until end of turn, whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy."
Double Vision90%
$0.54↑#2792↑0.39↑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."
Bonus Round90%
$3.50↑#4790↑0.47↑8.4 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."
Ether89%
$0.16↑#13760↓0.41↑1.4 years↓
", Exile this artifact: Add . When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
, Exile this artifact: Add . When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."