Mardu Ascendancy {R}{W}{B}
Enchantment
Whenever a nontoken creature you control attacks, create a 1/1 red Goblin creature token that's tapped and attacking.
Sacrifice this enchantment: Creatures you control get +0/+3 until end of turn.
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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.
Battle Cry Goblin 91%
$0.27#5010
"Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, create a 1/1 red Goblin creature token that's tapped and attacking."
Ainok Strike Leader 87%
$2.65#2324
"Whenever you attack with this creature and/or your commander, for each opponent, create a 1/1 red Goblin creature token that's tapped and attacking that player."
Squee, Dubious Monarch 84%
$0.59#5042
"Whenever this card attacks, create a 1/1 red Goblin creature token that's tapped and attacking."