Spark Double 
Creature — Illusion
$3.68 #396 0.55 7.3 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.
Chameleon, Master of Disguise76%
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"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.""
Stunt Double74%
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"You may have this creature enter as a copy of any creature on the battlefield."
Clone74%
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"You may have this creature enter as a copy of any creature on the battlefield."
Altered Ego72%
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"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."
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"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%
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"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."
Visage Bandit70%
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"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."
Undercover Operative70%
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"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%
$0.54↓#18240↓0.14↓15.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."