Cryptic Trilobite 

Creature — Trilobite
$1.78 #6857 0.07 6.4 years
This creature enters with X +1/+1 counters on it.
Remove a +1/+1 counter from this creature: Add 
. Spend this mana only to activate abilities.
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Cards similar to Cryptic Trilobite 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.
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$0.33↓#2954↑0.25↑9.8 years↑
"
: Put a +1/+1 counter on this creature."
+2 more matching lines
Workhorse84%
$3.13↑#13222↓0.21↑28.2 years↑
"Remove a +1/+1 counter from this creature: Add
."
+1 more matching line
Mikaeus, the Lunarch84%
$0.50↓#1952↑0.24↑15.0 years↑
"
: Put a +1/+1 counter on this card."
+1 more matching line
Haruspex83%
$0.39↓#11906↓0.50↑3.9 years↓
"
, Remove X +1/+1 counters from this creature: Add X mana of any one color."
Soldevi Machinist83%
$0.26↓#27664↓0.0031.3 years↑
"
: Add 
. Spend this mana only to activate abilities of artifacts."
James, Wandering Dad // Follow Him82%
$0.32↓#8618↓0.33↑2.5 years↓
"
: Add 
. Spend this mana only to activate abilities."
Spitting Hydra82%
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"This creature enters with four +1/+1 counters on it."
Walking Ballista82%
$7.21↑#430↑1.25↑9.6 years↑
"
: Put a +1/+1 counter on this creature."
+1 more matching line
Runaway Steam-Kin81%
$1.40↓#1661↑0.39↑7.9 years↑
"Remove three +1/+1 counters from this creature: Add 

."
Hargilde, Kindly Runechanter80%
$0.37↓#16908↓0.004.9 years↓
"
: Add 
. Spend this mana only to cast artifact spells or activate abilities of artifacts."
Salt Road Quartermasters80%
$0.05↓#28968↓0.36↑11.4 years↑
"
, Remove a +1/+1 counter from this creature: Put a +1/+1 counter on target creature."
+1 more matching line