Howl of the Horde 
Sorcery
$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.
Raid — If you attacked this turn, when you next cast an instant or sorcery spell this turn, copy that spell an additional time. You may choose new targets for the copy.
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Cards similar to Howl of the Horde 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 Example98%
$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."
Doublecast98%
$0.23↓#113420.13↓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 Palette96%
$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."
Galvanic Iteration96%
$0.27#2957↑0.20↓4.9 years↓
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Twinferno93%
$0.21↓#2608↑0.21↓4.0 years↓
"• When you cast your next instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Dual Strike92%
$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."
Storm King's Thunder90%
$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."
Cursed Recording90%
$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 Firebrand90%
$1.02↑#138520.00↓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."
Complete the Circuit90%
$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."
+1 more matching line
Najal, the Storm Runner89%
$0.18↓#122680.334.0 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."+1 more matching line
Summon: G.F. Cerberus88%
$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."
+1 more matching line
Repeated Reverberation88%
$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."
Swarm Intelligence88%
$0.36↑#4702↑0.379.1 years↓
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Gadwick's First Duel88%
$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 Post88%
$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."
Double Vision88%
$0.60↑#2730↑0.436.2 years↓
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Bonus Round88%
$3.59↑#4777↑0.21↓8.2 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."
The Mirari Conjecture86%
$0.28↑#127650.48↑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."
Ether86%
$0.19↓#137970.18↓1.2 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."