Undercover Operative 
Creature — Shapeshifter Rogue
$0.36 #5464 0.53 4.5 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. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)
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Cards similar to Undercover Operative 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.
Clone90%
$0.30↓#3704↑0.37↓33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double90%
$4.21↑#3814↑0.38↓10.1 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."
Quicksilver Gargantuan86%
$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."
Glasspool Mimic // Glasspool Shore85%
$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."
Vesuvan Doppelganger84%
$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.""
Altered Ego82%
$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."
Visage Bandit81%
$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."
Malleable Impostor81%
$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."
Protean Raider80%
$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."
Progenitor Mimic80%
$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.""
Dapper Shieldmate80%
$0.04↓#28077↓0.00↓4.5 years
"This creature enters with a shield counter on it."
Disciplined Duelist80%
$0.11↓#23195↓0.12↓4.5 years
"This creature enters with a shield counter on it."
Gigantoplasm80%
$0.62↑#9049↓0.39↓10.9 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.""
Flesh Duplicate78%
$8.92↑#2730↑0.463.0 years↓
"You may have this creature enter as a copy of any creature on the battlefield, except it has vanishing 3 if that creature doesn't have vanishing."
Jwari Shapeshifter78%
$3.84↑#10862↓0.13↓16.7 years↑
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Mirrorhall Mimic // Ghastly Mimicry78%
$1.65↑#4163↑0.30↓4.9 years
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Spirit in addition to its other types."
Synth Infiltrator78%
$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."
Swooping Protector78%
$0.04↓#24808↓0.06↓4.5 years
"This creature enters with a shield counter on it."
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."