Undercover Operative 
Creature — Shapeshifter Rogue
$0.37 #5371 0.32 4.4 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.
Stunt Double90%
$4.07↑#3805↑0.22↓10.0 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Clone90%
$0.31↓#3742↑0.3133.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image88%
$0.30↓#53820.19↓8.1 years↑
"You may have this creature enter as a copy of a creature you control."
Quicksilver Gargantuan86%
$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."
Glasspool Mimic // Glasspool Shore85%
$5.87↑#1166↑0.21↓5.9 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%
$18.79↑#17248↓0.3533.1 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.""
Mirrorhall Mimic // Ghastly Mimicry84%
$2.02↑#4095↑0.17↓4.8 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."
Altered Ego82%
$0.20↓#4080↑0.13↓10.4 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 Bandit82%
$0.15↓#7365↓0.412.4 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%
$5.78↑#44940.16↓3.0 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%
$0.68↑#13446↓0.67↑8.6 years↑
"If you attacked this turn, you may have this creature enter as a copy of any creature on the battlefield."
Progenitor Mimic80%
$1.11↑#53700.43↑13.3 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.""
Disciplined Duelist80%
$0.09↓#22834↓0.324.4 years
"This creature enters with a shield counter on it."
Dapper Shieldmate80%
$0.03↓#27641↓0.00↓4.4 years
"This creature enters with a shield counter on it."
Gigantoplasm80%
$0.49↑#9188↓0.05↓10.8 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.""
Renegade Doppelganger79%
$0.49↑#19345↓0.2416.4 years↑
"Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn."
Flesh Duplicate78%
$8.83↑#2745↑0.48↑2.9 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."
Swooping Protector78%
$0.10↓#24479↓0.244.4 years
"This creature enters with a shield counter on it."
Jwari Shapeshifter78%
$3.80↑#10806↓0.00↓16.6 years↑
"You may have this creature enter as a copy of any Ally creature on the battlefield."
The Master, Formed Anew78%
$0.23↓#19253↓0.242.9 years↓
"You may have this card enter as a copy of a creature card in exile with a takeover counter on it."