Mirror-Style Master {4}{R}{R}
Creature — Human Warrior
Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)
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. (Equipment, Auras you control, and counters are modifications.)
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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.
Flamerush Rider 94%
$0.17#4715
"Whenever this creature attacks, create a token that's a copy of another target attacking creature and that's tapped and attacking. Exile the token at end of combat."
Mardu Siegebreaker 94%
$0.46#3889
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
Redoubled Stormsinger 92%
$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."
Smirking Spelljacker 90%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Phantom Steed 90%
$0.44#11066
"Whenever this creature attacks, create a tapped and attacking token that's a copy of the exiled card, except it's an Illusion in addition to its other types. Sacrifice that token at end of combat."
Tilonalli's Skinshifter 90%
$0.26#22819
"Whenever this creature attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn."
Sunfrill Imitator 89%
$0.80#3713
"Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is this card and it has this ability."
Nacatl War-Pride 89%
$1.57#10261
"Whenever this creature attacks, create X tokens that are copies of it and that are tapped and attacking, where X is the number of creatures defending player controls. Exile the tokens at the beginning of the next end step."
Yuan Shao's Infantry 86%
$5.31#31156
"Whenever this creature attacks alone, this creature can't be blocked this combat."
Ogre Marauder 86%
$0.25#24804
"Whenever this creature attacks, it gains "this creature can't be blocked" until end of turn unless defending player sacrifices a creature of their choice."
Ekundu Cyclops 84%
$0.11#30718
"If a creature you control attacks, this creature also attacks if able."
Unruly Krasis 84%
$0.37#21385
"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."
Imperious Mindbreaker 84%
$0.37#14266
"As long as this card is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness.""
Creepy Puppeteer 84%
$0.19#25029
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Goliath Daydreamer 83%
$0.30#10121
"Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost."
Xantid Swarm 83%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Robber of the Rich 83%
$1.52#10249
"Whenever this creature attacks, if defending player has more cards in hand than you, exile the top card of their library. During any turn you attacked with a Rogue, you may cast that card and you may spend mana as though it were mana of any color to cast that spell."
Hardened Berserker 83%
$0.03#23580
"Whenever this creature attacks, the next spell you cast this turn costs {1} less to cast."
Conclave Evangelist 83%
$2.58#13660
"Whenever this creature deals combat damage to a player, create a token that's a copy of this creature."