Ivy, Gleeful Spellthief 

Legendary Creature — Faerie Rogue
$0.35 #6006 0.57 4.0 years
Flying
Whenever a player casts a spell that targets only a single creature other than Ivy, you may copy that spell. The copy targets Ivy. (A copy of an Aura spell becomes a token.)
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Cards similar to Ivy, Gleeful Spellthief 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.
Ink-Treader Nephilim84%
$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."
Mirrorwing Dragon81%
$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."
Frontline Heroism80%
$0.45↑#9003↓0.23↓1.8 years↓
"Whenever you cast a spell that targets only a single creature you control, create a 1/1 red Soldier creature token with haste, then copy that spell. The copy targets that token."
Radiant Performer77%
$1.05↑#11218↓0.30↓5.4 years↑
"When this creature enters, if you cast it from your hand, choose target spell or ability that targets only a single permanent or player. Copy that spell or ability for each other permanent or player the spell or ability could target. Each copy targets a different one of those permanents and players."
Feather, Radiant Arbiter76%
$0.38↑#14203↓0.00↓2.6 years↓
"Whenever you cast a noncreature spell that targets only this card, you may choose any number of other creatures that spell could target and pay
for each of those creatures. If you do, for each of those creatures, copy that spell. The copy targets that creature."
Zada, Hedron Grinder75%
$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."
Beamsplitter Mage72%
$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."
Precursor Golem72%
$0.17↓#12147↓0.32↓15.9 years↑
"Whenever a player casts an instant or sorcery spell that targets only a single Golem, that player copies that spell for each other Golem that spell could target. Each copy targets a different one of those Golems."
Leyline of Resonance72%
$0.73↑#53440.41↓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 Golem72%
$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."
Bill Potts71%
$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."
Agrus Kos, Eternal Soldier71%
$1.70↑#12006↓0.24↓3.8 years
"Whenever this card becomes the target of an ability that targets only it, you may pay 
. If you do, copy that ability for each other creature you control that ability could target. Each copy targets a different one of those creatures."