Mirelurk Queen 

Creature — Crab Mutant
$1.01 #4136 0.21 2.5 years
Vigilance
When this creature enters, target player gets two rad counters.
Whenever one or more nonland cards are milled, draw a card, then put a +1/+1 counter on this creature. This ability triggers only once each turn.
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Cards similar to Mirelurk Queen 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.
The Master, Transcendent84%
$0.83↓#5214↓0.67↑2.5 years
"When this card enters, target player gets two rad counters."
Nightkin Ambusher79%
$0.31↓#7135↓0.50↑2.5 years
"When this creature enters, target player gets four rad counters."
Returned Centaur76%
$0.04↓#21302↓0.1112.9 years↑
"When this creature enters, target player mills four cards."
Homarid Explorer76%
$0.08↓#24051↓0.71↑8.4 years↑
"When this creature enters, target player mills four cards."
Merrow Witsniper76%
$0.26↓#26272↓0.53↑18.6 years↑
"When this creature enters, target player mills a card."
Pensive Professor76%
$0.37↓#6367↓0.00↓0.4 years↓
"Whenever one or more +1/+1 counters are put on this creature, draw a card."
Exemplar of Light76%
$0.75↓#1245↑0.31↑1.8 years
"Whenever you put one or more +1/+1 counters on this creature, draw a card. This ability triggers only once each turn."
Dusk Legion Duelist75%
$1.80↑#2736↑0.193.4 years
"Whenever one or more +1/+1 counters are put on this creature, draw a card. This ability triggers only once each turn."
+1 more matching line
Fathom Mage75%
$0.26↓#1716↑0.2613.6 years↑
"Whenever a +1/+1 counter is put on this creature, you may draw a card."