Melira, Sylvok Outcast 
Legendary Creature — Human Scout
$3.81 #11464 0.22 15.4 years
You can't get poison counters.
Creatures you control can't have -1/-1 counters put on them.
Creatures your opponents control lose infect.
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Cards similar to Melira, Sylvok Outcast 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.
Darksteel Angel86%
$3.81#7408↑0.88↑0.0 years↓
"Creatures you control can't have -1/-1 counters put on them."
+1 more matching line
Solemnity78%
$7.62↑#3981↑1.34↑9.3 years↓
"Players can't get counters."
Vizier of Remedies74%
$0.21↓#117790.33↑9.5 years↓
"If one or more -1/-1 counters would be put on a creature you control, that many -1/-1 counters minus one are put on it instead."
Melira's Keepers70%
$0.03↓#32080↓0.00↓15.7 years
"This creature can't have counters put on it."
Melira, the Living Cure70%
$0.25↓#17513↓0.133.7 years↓
"If you would get one or more poison counters, instead you get one poison counter and you can't get additional poison counters this turn."
Tatterkite70%
$0.32↓#19471↓0.2718.5 years↑
"This creature can't have counters put on it."