Rhoda, Geist Avenger 
Legendary Creature — Human Soldier
$0.37 #10892 0.17 4.9 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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"Whenever a creature an opponent controls becomes tapped, put a +1/+1 counter on this creature."
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"Vigilance"
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"Vigilance"
Veteran of the Depths80%
$0.20↓#25344↓0.05↓19.0 years↑
"Whenever this creature becomes tapped, you may put a +1/+1 counter on it."
Timin, Youthful Geist78%
$0.37#103030.244.9 years
"Partner with Rhoda, Geist Avenger"
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$0.31↓#23350↓0.38↑0.3 years↓
"Vigilance"
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"Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card."
Tale of Katara and Toph75%
$2.03↑#5850↑0.200.9 years↓
"Creatures you control have "Whenever this creature becomes tapped for the first time during each of your turns, put a +1/+1 counter on it.""
Cazur, Ruthless Stalker75%
$0.38↑#8419↑0.186.5 years↑
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
+1 more matching line
Farfinder74%
$0.26↓#15461↓0.00↓6.5 years↑
"Vigilance"
Palliation Accord74%
$0.37#19785↓0.00↓20.5 years↑
"Whenever a creature an opponent controls becomes tapped, put a palliation counter on this enchantment."
Garruk's Warsteed74%
$0.23↓#26578↓0.00↓6.3 years↑
"Vigilance"
Eivor, Battle-Ready74%
$4.00↑#92770.132.3 years↓
"Vigilance"
Freyalise's Winds72%
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"Whenever a permanent becomes tapped, put a wind counter on it."
Shaun & Rebecca, Agents72%
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"Vigilance"
Zar Ojanen, Scion of Efrava72%
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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."
Unholy Officiant72%
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"Vigilance"
Faithful Watchdog72%
$0.19↓#89800.00↓2.3 years↓
"Vigilance"