Anafenza, Kin-Tree Spirit 

Legendary Creature — Spirit Soldier
$0.26 #6085 0.06 11.6 years
Whenever another nontoken creature you control enters, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)
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Cards similar to Anafenza, Kin-Tree Spirit 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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"Whenever another creature you control enters, put a +1/+1 counter on that creature."
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"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
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"Whenever another creature you control enters, put a +1/+1 counter on this creature."
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"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Mabel, Valley Hero83%
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"Whenever this card or another creature you control enters, put a +1/+1 counter on target creature that entered this turn."
Mighty Mutanimals80%
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"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Warden of the Grove79%
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"Whenever another nontoken creature you control enters, it endures X, where X is the number of counters on this creature."
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$0.23↓#9928↓0.29↑0.6 years↓
"Whenever another nontoken creature you control enters, put a +1/+1 counter on target creature."
Ivy Lane Denizen77%
$0.20↓#2484↑0.22↑13.7 years↑
"Whenever another green creature you control enters, put a +1/+1 counter on target creature."
Skyknight Squire76%
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"Whenever another creature you control enters, put a +1/+1 counter on this creature."
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"Whenever another nontoken creature you control enters, proliferate."
Durable Handicraft76%
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"Whenever a creature you control enters, you may pay
. If you do, put a +1/+1 counter on that creature."
Hulkling, Burgeoning Bruiser76%
$0.13↓#21862↓0.19↑0.3 years↓
"Whenever another creature you control enters, if it has greater power or toughness than this card, put a +1/+1 counter on this card."
Securitron Squadron74%
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"Whenever a creature token you control enters, put a +1/+1 counter on it."
Serra Redeemer74%
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"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."
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"Whenever another Mutant you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this card."
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"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout74%
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"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."