Altered Ego {X}{2}{G}{U}
Creature — Shapeshifter
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 that do something similar 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.
Undercover Operative 89%
$0.37#5367
"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."
Auton Soldier 88%
$10.83#2016
"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."
Jwari Shapeshifter 87%
$3.79#10849
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Stunt Double 87%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
Naga Fleshcrafter 87%
$0.33#5377
"You may have this creature enter as a copy of any creature on the battlefield."
Clone 87%
$0.63#3831
"You may have this creature enter as a copy of any creature on the battlefield."
Gigantoplasm 86%
$0.59#9543
"You may have this creature enter as a copy of any creature on the battlefield, except it has "{X}: This creature has base power and toughness X/X.""
Progenitor Mimic 86%
$1.38#5243
"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.""
Spark Double 85%
$14.28#401
"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."
Omni-Changeling 84%
$0.31#6806
"You may have this creature enter as a copy of any creature on the battlefield, except it has changeling."
Synth Infiltrator 84%
$0.25#8793
"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."
+1 more matching line
Vizier of Many Faces 83%
$0.30#4322
"You may have this creature enter as a copy of any creature on the battlefield, except if this creature was embalmed, the token has no mana cost, it's white, and it's a Zombie in addition to its other types."
Vesuvan Doppelganger 83%
#16958
"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.""
Clever Impersonator 83%
$4.84#1275
"You may have this creature enter as a copy of any nonland permanent on the battlefield."
Sakashima's Student 82%
$24.41#3600
"You may have this creature enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types."
Pirated Copy 82%
$7.51#8155
"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.""
Phyrexian Metamorph 82%
$2.32#306
"You may have this creature enter as a copy of any artifact or creature on the battlefield, except it's an artifact in addition to its other types."
Mirrorhall Mimic // Ghastly Mimicry 81%
$1.19#4100
"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."
Copycrook 80%
$0.23#6275
"You may have this creature enter as a copy of any creature on the battlefield, except it has "Whenever this creature attacks, it connives.""