Yahenni, Undying Partisan 
Legendary Creature — Aetherborn Vampire
$0.28 #1036 0.33 9.7 years
Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.
Sacrifice another creature: Yahenni gains indestructible until end of turn.
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Cards similar to Yahenni, Undying Partisan 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 a creature an opponent controls dies, put a +1/+1 counter on this creature."
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"Sacrifice another creature: this card gains indestructible until end of turn."
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"Sacrifice another creature: This creature gains indestructible until end of turn. Tap it."
Falkenrath Aristocrat84%
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"Sacrifice a creature: This creature gains indestructible until end of turn. If the sacrificed creature was a Human, put a +1/+1 counter on this creature."
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"Whenever a nontoken creature an opponent controls dies, put a +1/+1 counter on each creature you control."
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$0.22↓#9499↓0.50↑3.3 years↓
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Lumberknot81%
$0.12↓#15549↓0.00↓15.1 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial81%
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"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Clickslither81%
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"Haste"
Rockslide Elemental80%
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"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Vampire Warlord80%
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"Sacrifice another creature: Regenerate this creature."
Pitiless Pontiff80%
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"
, Sacrifice another creature: This creature gains deathtouch and indestructible until end of turn."
, Sacrifice another creature: This creature gains deathtouch and indestructible until end of turn."
Kraven the Hunter80%
$0.25↓#14158↓0.281.1 years↓
"Whenever a creature an opponent controls with the greatest power among creatures that player controls dies, draw a card and put a +1/+1 counter on this card."
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"Sacrifice a creature: Put a +1/+1 counter on this creature."
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"Sacrifice a creature: Put a +1/+1 counter on this creature."
Swarm of Bloodflies80%
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"Whenever another creature dies, put a +1/+1 counter on this creature."
Scavenger Drake80%
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"Whenever another creature dies, you may put a +1/+1 counter on this creature."
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", Sacrifice another creature: This creature gains indestructible until end of turn. Tap it."
, Sacrifice another creature: This creature gains indestructible until end of turn. Tap it."