Phyrexian Marauder 
Artifact Creature — Phyrexian Construct
$3.45 #16817 0.29 29.7 years
This creature enters with X +1/+1 counters on it.
This creature can't block.
This creature can't attack unless you pay
for each +1/+1 counter on it.
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Cards similar to Phyrexian Marauder 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.
Myr Prototype94%
$0.18↓#23445↓0.06↓23.0 years↓
"This creature can't attack or block unless you pay
for each +1/+1 counter on it."
+1 more matching line
Pipsqueak, Rebel Strongarm92%
$0.19↓#26920↓0.15↓0.9 years↓
"this card can't attack alone unless he has a +1/+1 counter on him."
Giant Turtle88%
$0.43↓#27776↓0.3232.4 years↑
"This creature can't attack if it attacked during your last turn."
Qal Sisma Behemoth87%
$0.04↓#30988↓0.00↓11.6 years↓
"This creature can't attack or block unless you pay
."
Faithful Watchdog84%
$0.19↓#8980↑0.00↓2.3 years↓
"This creature enters with three +1/+1 counters on it."
Adaptive Shimmerer84%
$0.10↓#23305↓0.226.5 years↓
"This creature enters with three +1/+1 counters on it."
Goblin Cohort82%
$0.20↓#25146↓0.00↓21.7 years↓
"This creature can't attack unless you've cast a creature spell this turn."
Savage Firecat82%
$0.24↓#31096↓0.00↓25.1 years↓
"This creature enters with seven +1/+1 counters on it."