Beamsplitter Mage {U}{R}
Creature — Vedalken Wizard
Whenever you cast an instant or sorcery spell that targets only this creature, if you control one or more other creatures that spell could target, choose one of those creatures. Copy that spell. The copy targets the chosen 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.
Leyline of Resonance 88%
$0.98#5505
"Whenever you cast an instant or sorcery spell that targets only a single creature you control, copy that spell. You may choose new targets for the copy."
Mirrorwing Dragon 87%
$0.24#8252
"Whenever a player casts an instant or sorcery spell that targets only this creature, that player copies that spell for each other creature they control that the spell could target. Each copy targets a different one of those creatures."
Ink-Treader Nephilim 86%
$1.46#21214
"Whenever a player casts an instant or sorcery spell, if that spell targets only this creature, copy the spell for each other creature that spell could target. Each copy targets a different one of those creatures."
Snooping Page 81%
$0.17#19392
"Whenever you cast an instant or sorcery spell that targets a creature, this creature can't be blocked this turn."