Mind Maggots 
Creature — Insect
$0.26 #27988 0.23 28.2 years
When this creature enters, discard any number of creature cards. For each card discarded this way, put two +1/+1 counters on this creature.
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Cards similar to Mind Maggots 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.
Lotleth Troll86%
$0.15↓#14637↑0.55↑13.9 years↓
"Discard a creature card: Put a +1/+1 counter on this creature."
Mercenary Knight86%
$3.39↑#303040.47↑29.3 years↑
"When this creature enters, sacrifice it unless you discard a creature card."
Charnel Troll82%
$0.12↓#288290.07↓7.9 years↓
"
, Discard a creature card: Put a +1/+1 counter on this creature."
, Discard a creature card: Put a +1/+1 counter on this creature."
Body Snatcher78%
$0.26#12554↑0.00↓27.2 years
"When this creature enters, exile it unless you discard a creature card."
Hidden Horror78%
$0.18↓#291570.2529.2 years↑
"When this creature enters, sacrifice it unless you discard a creature card."
Crypt Lurker75%
$0.10↓#238820.276.2 years↓
"When this creature enters, you may sacrifice a creature or discard a creature card. If you do, draw a card."