Myr Prototype 
Artifact Creature — Myr
$0.16 #23265 0.50 22.9 years
At the beginning of your upkeep, put a +1/+1 counter on this creature.
This creature can't attack or block unless you pay 
for each +1/+1 counter on it.
for each +1/+1 counter on it.Click a line or tag to filter
Cards similar to Myr Prototype 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.
Phyrexian Marauder94%
$3.38↑#16527↑0.05↓29.6 years↑
"This creature can't attack unless you pay for each +1/+1 counter on it."
for each +1/+1 counter on it."+1 more matching line
Qal Sisma Behemoth94%
$0.05↓#30717↓0.00↓11.4 years↓
"This creature can't attack or block unless you pay 
."
."
Sab-Sunen, Luxa Embodied91%
$1.85↑#5536↑0.28↓1.6 years↓
"this card can't attack or block unless it has an even number of counters on it."
Jackal Familiar91%
$0.13↓#29760↓0.69↑17.1 years↓
"This creature can't attack or block alone."
Ember Beast91%
$0.03↓#30048↓0.00↓24.9 years↑
"This creature can't attack or block alone."
Bonded Horncrest91%
$0.12↓#271970.18↓8.9 years↓
"This creature can't attack or block alone."
Mogg Flunkies91%
$0.04↓#221810.29↓28.5 years↑
"This creature can't attack or block alone."
Loyal Pegasus91%
$0.20↑#193850.00↓12.6 years↓
"This creature can't attack or block alone."
Slumbering Dragon89%
$2.08↑#12419↑0.25↓14.1 years↓
"This creature can't attack or block unless it has five or more +1/+1 counters on it."
Wojek Bodyguard88%
$0.08↓#266140.00↓7.9 years↓
"This creature can't attack or block alone."
Rushwood Elemental86%
$0.98↑#28048↓0.25↓26.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Bast, Panther Goddess86%
$1.19↑#13478↑0.00↓0.2 years↓
"this card can't attack or block unless you control three or more creatures."
Goblin Goon84%
$0.29↑#207310.13↓23.6 years
"This creature can't block unless you control more creatures than attacking player."
Mogg Toady84%
$0.09↓#30924↓0.16↓26.6 years↑
"This creature can't block unless you control more creatures than attacking player."
Wirecat84%
$0.21↑#31698↓0.22↓27.9 years↑
"This creature can't attack or block if an enchantment is on the battlefield."
Monstrous Hound84%
$0.23↑#31554↓0.24↓28.3 years↑
"This creature can't block unless you control more lands than attacking player."
Technodrome84%
$1.91↑#10728↑0.00↓0.5 years↓
"This creature can't attack or block unless its power is 6 or greater."
Craven Hulk83%
$0.06↓#29435↓0.00↓5.6 years↓
"This creature can't block alone."
Orcish Conscripts83%
$0.07↓#30546↓0.6031.3 years↑
"This creature can't attack unless at least two other creatures attack."
Bonded Construct82%
$0.04↓#226230.29↓11.1 years↓
"This creature can't attack alone."