Spinerock Tyrant 
Creature — Dragon
$1.47 #9739 0.00 0.6 years
Flying
Wither (This deals damage to creatures in the form of -1/-1 counters.)
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.
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Cards similar to Spinerock Tyrant 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 Mage89%
$0.28↓#21107↓0.067.9 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."
Leyline of Resonance88%
$0.73↓#5344↑0.41↑1.9 years↑
"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."
Reflective Golem88%
$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."
Zada, Hedron Grinder88%
$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."
Bill Potts86%
$0.15↓#22954↓0.33↑2.9 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."
Exterminator Magmarch83%
$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."
Ink-Treader Nephilim83%
$6.40↑#19386↓0.33↑20.6 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."
Chandra's Spitfire81%
$0.19↓#14018↓0.20↑16.1 years↑
"Flying"
Akroan Skyguard80%
$0.11↓#19504↓0.29↑12.6 years↑
"Flying"
Swarm Intelligence80%
$0.36↓#4702↑0.37↑9.1 years↑
"Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy."
Double Vision80%
$0.60↓#2730↑0.43↑6.2 years↑
"Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy."
Mirrorwing Dragon79%
$0.30↓#81960.14↑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."
Radiate78%
$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."
Mirari77%
$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."
Lucky Clover76%
$0.29↓#104510.26↑6.9 years↑
"Whenever you cast an Adventure instant or sorcery spell, copy it. You may choose new targets for the copy."
Riku of Two Reflections75%
$5.72↑#12137↓0.47↑15.2 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 Casting74%
$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."
Reverberate74%
$2.95↑#1406↑0.35↑16.1 years↑
"Copy target instant or sorcery spell. You may choose new targets for the copy."
Twincast74%
$6.50↑#6258↑0.0021.3 years↑
"Copy target instant or sorcery spell. You may choose new targets for the copy."
Thousand-Year Storm74%
$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."