Protean Raider 


Creature — Shapeshifter Pirate
Raid — If you attacked this turn, you may have this creature enter as a copy of any creature on the battlefield.
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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.
Redoubled Stormsinger 87%
$0.25#3402
"Whenever this creature attacks, for each creature token you control that entered this turn, create a tapped and attacking token that's a copy of that token. At the beginning of the next end step, sacrifice those tokens."
Auton Soldier 86%
$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."
Copycrook 85%
$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.""
Progenitor Mimic 83%
$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.""
Jwari Shapeshifter 83%
$3.79#10849
"You may have this creature enter as a copy of any Ally creature on the battlefield."
Undercover Operative 83%
$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."
Stunt Double 83%
$4.51#3870
"You may have this creature enter as a copy of any creature on the battlefield."
Naga Fleshcrafter 83%
$0.33#5377
"You may have this creature enter as a copy of any creature on the battlefield."
Clone 83%
$0.63#3831
"You may have this creature enter as a copy of any creature on the battlefield."
Gigantoplasm 83%
$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.""
Pirated Copy 83%
$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.""
Omni-Changeling 82%
$0.31#6806
"You may have this creature enter as a copy of any creature on the battlefield, except it has changeling."
Synth Infiltrator 82%
$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."
Dack's Duplicate 81%
$0.43#10875
"You may have this creature enter as a copy of any creature on the battlefield, except it has haste and dethrone."
Vizier of Many Faces 81%
$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."
Sakashima's Student 81%
$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."
Mirror-Style Master 81%
$0.27#12093
"Whenever this creature attacks, for each attacking modified creature you control, create a tapped and attacking token that's a copy of that creature. Exile those tokens at end of combat."
Fugitive Droid 81%
$0.29#12875
"This creature can't be blocked if an artifact entered the battlefield under your control this turn."
Vesuvan Doppelganger 80%
#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.""