Spark Double 
Creature — Illusion
$4.94 #375 0.60 7.5 years
You may have this creature enter as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary.
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Cards similar to Spark Double 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.
Mirror Image75%
$0.30↓#5189↓0.06↓8.3 years
"You may have this creature enter as a copy of a creature you control."
Sakashima the Impostor75%
$13.20↑#2043↓0.5221.4 years↑
"You may have this card enter as a copy of any creature on the battlefield, except its name is this card, it's legendary in addition to its other types, and it has "
: Return this card to its owner's hand at the beginning of the next end step.""
: Return this card to its owner's hand at the beginning of the next end step.""
Chameleon, Master of Disguise74%
$0.39↓#1718↓0.38↓1.1 years↓
"You may have this card enter as a copy of a creature you control, except his name is this card."
Clone74%
$0.30↓#3704↓0.37↓33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double74%
$4.21↓#3814↓0.38↓10.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Altered Ego72%
$0.20↓#4024↓0.15↓10.5 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it."
Glasspool Mimic // Glasspool Shore72%
$6.55↑#1165↓0.27↓6.1 years↓
"You may have this creature enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types."
Auton Soldier70%
$12.77↑#2040↓0.583.0 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it isn't legendary, is an artifact in addition to its other types, and has myriad."
Undercover Operative70%
$0.36↓#5464↓0.534.5 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature."
Quicksilver Gargantuan70%
$0.51↓#18556↓0.43↓16.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."