Phyrexian Marauder 
Artifact Creature — Phyrexian Construct
This creature enters with X +1/+1 counters on it.
This creature can't block.
This creature can't attack unless you pay {1} for each +1/+1 counter 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.
Bloodcrazed Goblin 85%
$0.18#25197
"This creature can't attack unless an opponent has been dealt damage this turn."
Warden of the Chained 85%
$0.10#27889
"This creature can't attack unless you control another creature with power 4 or greater."
Lambholt Pacifist // Lambholt Butcher 84%
$0.21#23485
"This creature can't attack unless you control a creature with power 4 or greater."
Goblin Cohort 84%
$0.24#24308
"This creature can't attack unless you've cast a creature spell this turn."
Mogg Conscripts 84%
#27105
"This creature can't attack unless you've cast a creature spell this turn."
Okk 84%
$0.45#24155
"This creature can't attack unless a creature with greater power also attacks."
+1 more matching line
Orcish Conscripts 83%
#30294
"This creature can't attack unless at least two other creatures attack."
+1 more matching line
Harbor Serpent 83%
$0.14#20206
"This creature can't attack unless there are five or more Islands on the battlefield."
Silburlind Snapper 82%
$0.04#26997
"This creature can't attack unless you've cast a noncreature spell this turn."
Floodtide Serpent 82%
$0.06#29779
"This creature can't attack unless you return an enchantment you control to its owner's hand."
Scuttlegator 82%
$0.12#20712
"As long as this creature has a +1/+1 counter on it, it can attack as though it didn't have defender."
Skyclave Sentinel 82%
$0.08#23875
"As long as this creature has a +1/+1 counter on it, it can attack as though it didn't have defender."
River Serpent 81%
$0.21#18500
"This creature can't attack unless there are five or more cards in your graveyard."
Mogg Toady 81%
$0.11#30572
"This creature can't attack unless you control more creatures than defending player."
+1 more matching line
Goblin Goon 81%
$0.35#20282
"This creature can't attack unless you control more creatures than defending player."
+1 more matching line
Vantress Gargoyle 81%
$0.32#11501
"This creature can't attack unless defending player has seven or more cards in their graveyard."
+1 more matching line