Rhoda, Geist Avenger 
Legendary Creature — Human Soldier
$0.37 #10617 0.06 4.8 years
Partner with Timin, Youthful Geist (When this creature enters, target player may put Timin into their hand from their library, then shuffle.)
Vigilance
Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, put a +1/+1 counter on Rhoda.
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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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"Vigilance"
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"Whenever this creature becomes tapped, you may put a +1/+1 counter on it."
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"Vigilance"
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"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
+1 more matching line
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"Vigilance"
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"Whenever this card becomes tapped, put a +1/+1 counter on each creature you control with toughness less than the number of basic land types among lands you control."