Howl of the Horde 
Sorcery
$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.
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.
Doublecast98%
$0.23↓#115830.25↓8.3 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 Example98%
$0.12↓#7736↑0.285.5 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 Palette96%
$0.28↑#146670.07↓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."
Galvanic Iteration95%
$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."
Twinferno93%
$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."
Dual Strike91%
$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."
Storm King's Thunder90%
$3.25↑#5765↑0.24↓4.4 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."
Cursed Recording90%
$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 Firebrand90%
$0.82↑#139600.11↓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."
Complete the Circuit90%
$0.20↓#9108↑0.20↓3.5 years↓
"When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies."
+1 more matching line
Najal, the Storm Runner89%
$0.15↓#125860.17↓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."+1 more matching line
Summon: G.F. Cerberus88%
$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."
+1 more matching line
Repeated Reverberation88%
$0.34↑#7757↑0.317.3 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."
Swarm Intelligence88%
$0.36↑#4855↑0.429.3 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%
$0.19↓#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."
Adaptive Training Post88%
$0.23↓#8305↑0.18↓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."
Double Vision88%
$0.54↑#2792↑0.396.3 years↓
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Bonus Round88%
$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."
The Mirari Conjecture86%
$0.24↓#130280.25↓8.5 years↓
"Until end of turn, whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy."
Ether86%
$0.16↓#137600.411.4 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."