Leyline of Resonance 
Enchantment
$0.73 #5344 0.41 1.9 years
If this card is in your opening hand, you may begin the game with it on the battlefield.
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.
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Cards similar to Leyline of Resonance 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.
Beamsplitter Mage98%
$0.28↓#21107↓0.06↓7.9 years↑
"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."
Zada, Hedron Grinder97%
$0.13↓#3402↑0.77↑10.9 years↑
"Whenever you cast an instant or sorcery spell that targets only this card, copy that spell for each other creature you control that the spell could target. Each copy targets a different one of those creatures."
Reflective Golem96%
$0.09↓#23881↓0.12↓5.4 years↑
"Whenever you cast an instant or sorcery spell that targets only this creature, 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."
Bill Potts95%
$0.15↓#22954↓0.332.9 years
"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."
Swarm Intelligence94%
$0.36↓#47020.379.1 years↑
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Double Vision93%
$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."
Mirari91%
$0.42↓#15206↓0.88↑24.9 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."
Ink-Treader Nephilim91%
$6.40↑#19386↓0.3320.6 years↑
"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."
Exterminator Magmarch90%
$0.29↓#13923↓0.26↓2.2 years
"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."
Spinerock Tyrant88%
$1.47↑#9739↓0.00↓0.6 years↓
"Whenever you cast an instant or sorcery spell with a single target, you may copy it. If you do, those spells gain wither. You may choose new targets for the copy."
Mirrorwing Dragon88%
$0.30↓#8196↓0.14↓10.1 years↑
"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."
Riku of Two Reflections88%
$5.72↑#12137↓0.4715.2 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."
Cloven Casting87%
$0.25↓#22362↓0.58↑17.3 years↑
"Whenever you cast a multicolored 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."
Aziza, Mage Tower Captain86%
$0.17↓#12687↓0.00↓0.4 years↓
"Whenever you cast an instant or sorcery spell, you may tap three untapped creatures you control. If you do, copy that spell. You may choose new targets for the copy."
Sevinne, the Chronoclasm86%
$0.25↓#20234↓0.71↑7.0 years↑
"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."
Thousand-Year Storm84%
$1.08↑#1409↑0.64↑7.9 years↑
"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."
Melek, Izzet Paragon84%
$0.19↓#7411↓0.30↓13.4 years↑
"Whenever you cast an instant or sorcery spell from your library, copy it. You may choose new targets for the copy."
Fin Fang Foom84%
$0.35↓#20753↓0.00↓0.2 years↓
"Whenever you cast an instant or sorcery spell that targets an artifact or land, copy that spell. You may choose new targets for the copy. Put two +1/+1 counters on this card."
Radiate84%
$4.14↑#13913↓0.29↓24.6 years↑
"Choose target instant or sorcery spell that targets only a single permanent or player. Copy that spell for each other permanent or player the spell could target. Each copy targets a different one of those permanents and players."
Zevlor, Elturel Exile82%
$0.26↓#13083↓0.72↑4.2 years↑
", 
: When you next cast an instant or sorcery spell that targets only a single opponent or a single permanent an opponent controls this turn, for each other opponent, choose that player or a permanent they control, copy that spell, and the copy targets the chosen player or permanent."
, : When you next cast an instant or sorcery spell that targets only a single opponent or a single permanent an opponent controls this turn, for each other opponent, choose that player or a permanent they control, copy that spell, and the copy targets the chosen player or permanent."