Summon: G.F. Cerberus 
Enchantment Creature — Saga Dog
$0.30 #7564 0.75 1.4 years
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
II — Double — When you next cast an instant or sorcery spell this turn, copy it. You may choose new targets for the copy.
III — Triple — When you next cast an instant or sorcery spell this turn, copy it twice. You may choose new targets for the copies.
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Cards similar to Summon: G.F. Cerberus 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.
Doublecast92%
$0.23↓#11583↓0.25↓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 Example92%
$0.12↓#77360.28↓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 Palette89%
$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 Horde88%
$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."
+1 more matching line
Adaptive Training Post88%
$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."
Galvanic Iteration88%
$0.26↓#3001↑0.38↓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."
Complete the Circuit88%
$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
Ether87%
$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."
Bonus Round86%
$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."
Twinferno86%
$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."
Najal, the Storm Runner86%
$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."+1 more matching line
Swarm Intelligence86%
$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 Conjecture86%
$0.24↓#13028↓0.25↓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."
Double Vision86%
$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."
Storm King's Thunder85%
$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."
Mirari85%
$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."
Cursed Recording84%
$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."
Chandra, the Firebrand84%
$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 Duel84%
$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."
Dual Strike84%
$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."