Exterminator Magmarch {2}{B}{R}
Artifact Creature — Phyrexian Construct
Whenever you cast an instant or sorcery spell that targets only a single nonland permanent an opponent controls, if another opponent controls one or more nonland permanents that spell could target, choose one of those permanents. Copy that spell. The copy targets the chosen permanent.
{1}{B}: Regenerate this creature.
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Cards that do something similar 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.
Bill Potts 84%
$0.18#22529
"Whenever you cast an instant or sorcery spell that targets only this card or activate an ability that targets only this card, copy that spell or ability. You may choose new targets for the copy. This ability triggers only once each turn."
Veyran, Voice of Duality 83%
$1.36#790
"If you casting or copying an instant or sorcery spell causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time."
Thousand-Year Storm 83%
$1.37#1394
"Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies."
Unbound Flourishing 83%
$2.17#2696
"Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy."
Orvar, the All-Form 82%
$3.15#5496
"Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents."
Sevinne, the Chronoclasm 82%
#19831
"Whenever you cast your first instant or sorcery spell from your graveyard each turn, copy that spell. You may choose new targets for the copy."
Sorcerer Class 81%
$2.98#3636
"Whenever you cast an instant or sorcery spell, that spell deals damage to each opponent equal to the number of instant and sorcery spells you've cast this turn."
Galvanic Iteration 80%
$0.26#2918
"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 Palette 80%
$0.10#18650
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Doublecast 80%
$0.21#11121
"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 Horde 80%
$0.24#13504
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Teach by Example 80%
$0.12#7586
"When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."
Chandra, Hope's Beacon 80%
$2.62#4076
"Whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy. This ability triggers only once each turn."
Overmaster 80%
$2.99#3095
"The next instant or sorcery spell you cast this turn can't be countered."
Double Vision 80%
$0.60#2668
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Swarm Intelligence 80%
$0.39#4549
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Harsh Judgment 80%
$0.40#29157
"If an instant or sorcery spell of the chosen color would deal damage to you, it deals that damage to its controller instead."
Invasion of Arcavios // Invocation of the Founders 80%
$0.31#10248
"Whenever you cast an instant or sorcery spell from your hand, you may copy that spell. You may choose new targets for the copy."