Melira's Keepers 
Creature — Human Warrior
$0.03 #32080 0.00 15.7 years
This creature can't have counters put on it.
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Cards similar to Melira's Keepers 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.
Tatterkite100%
$0.32↑#19471↑0.27↑18.5 years↑
"This creature can't have counters put on it."
Solemnity83%
$7.62↑#3981↑1.34↑9.3 years↓
"Players can't get counters."