Altered Ego 
Creature — Shapeshifter
$0.20 #4024 0.15 10.5 years
This spell can't be countered.
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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Cards similar to Altered Ego 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.
Clone91%
$0.30↑#37040.37↑33.2 years↑
"You may have this creature enter as a copy of any creature on the battlefield."
Stunt Double91%
$4.21↑#38140.38↑10.1 years
"You may have this creature enter as a copy of any creature on the battlefield."
Mirror Image90%
$0.30↑#5189↓0.068.3 years↓
"You may have this creature enter as a copy of a creature you control."
Quicksilver Gargantuan87%
$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."
Terra Stomper87%
$0.17↓#15687↓0.0617.0 years↑
"This spell can't be countered."
Vexing Beetle87%
$0.26↑#31784↓0.00↓23.7 years↑
"This spell can't be countered."
Hit-Monkey84%
$2.68↑#12010↓0.58↑0.3 years↓
"This spell can't be countered."
Gigantic Big Bear84%
$0.45↑#10399↓0.240.2 years↓
"This spell can't be countered."
Blurred Mongoose84%
$0.59↑#30655↓0.00↓26.0 years↑
"This spell can't be countered."
Carnage Tyrant84%
$0.53↑#6466↓0.189.1 years↓
"This spell can't be countered."
Glasspool Mimic // Glasspool Shore84%
$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."
Gigantoplasm82%
$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.""
Undercover Operative82%
$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."
Malleable Impostor82%
$5.86↑#46000.113.1 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."
Petrified Wood-Kin82%
$0.27↑#28305↓0.26↑20.7 years↑
"This spell can't be countered."
Last Word82%
$0.66↑#18710↓0.35↑22.7 years↑
"This spell can't be countered."
Vesuvan Doppelganger82%
$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.""
Progenitor Mimic81%
$1.06↑#5506↓0.27↑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.""
Loxodon Smiter81%
$0.26↑#23471↓0.0614.0 years↑
"This spell can't be countered."
Heated Debate81%
$0.14↓#20521↓0.065.5 years↓
"This spell can't be countered."