Marwyn, the Nurturer 

Legendary Creature — Elf Druid
$5.42 #1205 0.55 8.4 years
Whenever another Elf you control enters, put a +1/+1 counter on Marwyn.
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Cards similar to Marwyn, the Nurturer 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.
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"
: Add an amount of
equal to this creature's power."
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"
: Add an amount of
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"
: Add an amount of
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"
: Add an amount of
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"
: Add X mana of any one color, where X is this creature's power."
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"Whenever another Elf you control enters, this creature gets +1/+1 until end of turn."
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"
: Add X mana of any one color, where X is this card's power."
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"
: Add X mana of any one color, where X is this card's power."
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"
: Add X mana in any combination of
and/or
, where X is this card's power. Activate only during your turn and only once each turn."
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"
: Add X mana of any one color, where X is this creature's power."
Bighorner Rancher84%
$0.48↓#6122↓0.25↓2.5 years↓
"
: Add an amount of
equal to the greatest power among creatures you control."
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"Whenever another Elf enters, put a +1/+1 counter on this creature."
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$0.19↓#7681↓0.25↓5.8 years↓
"
: Add an amount of
equal to the greatest power among creatures you control that entered this turn."