Mocking Doppelganger 
Creature — Shapeshifter
$2.79 #5559 0.48 4.4 years
Flash
You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded." (They attack each combat if able and attack a player other than you if able.)
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Cards similar to Mocking Doppelganger 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.
Clone88%
$0.30↓#3704↑0.37↓33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double88%
$4.21↑#3814↑0.3810.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image88%
$0.30↓#51890.06↓8.3 years↑
"You may have this creature enter as a copy of a creature you control."
Pirated Copy84%
$7.76↑#8175↓0.10↓3.9 years
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Pirate in addition to its other types and it has "Whenever this creature or another creature with the same name deals combat damage to a player, you draw a card.""
Quicksilver Gargantuan84%
$0.51↓#18556↓0.4316.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Malleable Impostor84%
$5.86↑#46000.11↓3.1 years↓
"You may have this creature enter as a copy of a creature an opponent controls, except it's a Faerie Shapeshifter in addition to its other types and it has flying."
+1 more matching line
Glasspool Mimic // Glasspool Shore83%
$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."
Progenitor Mimic82%
$1.06↓#55060.27↓13.5 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "At the beginning of your upkeep, if this creature isn't a token, create a token that's a copy of this creature.""
Chameleon, Master of Disguise80%
$0.39↓#1718↑0.381.1 years↓
"You may have this card enter as a copy of a creature you control, except his name is this card."
Gigantoplasm80%
$0.62↓#9049↓0.3910.9 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "
: This creature has base power and toughness X/X.""
: This creature has base power and toughness X/X.""
Uncontrollable Anger80%
$0.04↓#28791↓0.06↓22.1 years↑
"Flash"
Vesuvan Doppelganger80%
$18.14↑#17549↓0.28↓33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability.""
Visage Bandit79%
$0.17↓#7390↓0.15↓2.5 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."
Protean Raider79%
$0.71↓#13786↓0.17↓8.8 years↑
"If you attacked this turn, you may have this creature enter as a copy of any creature on the battlefield."
Evil Twin78%
$0.40↓#6999↓0.5315.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it has "
, 
: Destroy target creature with the same name as this creature.""
, : Destroy target creature with the same name as this creature.""
Waxen Shapethief77%
$0.34↓#58680.06↓1.7 years↓
"You may have this creature enter as a copy of an artifact or creature you control."
Altered Ego77%
$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."
Synth Infiltrator76%
$0.29↓#9035↓0.06↓2.6 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Synth artifact creature in addition to its other types."
Phantasmal Image76%
$4.69↑#1510↑0.25↓15.3 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's an Illusion in addition to its other types and it has "When this creature becomes the target of a spell or ability, sacrifice it.""
Ravener76%
$0.99↓#10340↓0.21↓4.0 years
"Flash"