Yahenni, Undying Partisan 
Legendary Creature — Aetherborn Vampire
$0.27 #1031 0.24 9.6 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.
Malakir Cullblade94%
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Sephiroth, Planet's Heir87%
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature."
Elder Arthur Maxson85%
$0.32↑#8844↓0.43↑2.5 years↓
"Sacrifice another creature: this card gains indestructible until end of turn."
Immersturm Predator85%
$0.16↓#6998↓0.48↑5.6 years↓
"Sacrifice another creature: This creature gains indestructible until end of turn. Tap it."
Falkenrath Aristocrat84%
$0.34↑#14645↓0.3114.6 years↑
"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."
Legolas, Counter of Kills82%
$0.21↓#9420↓0.213.2 years↓
"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Lumberknot80%
$0.11↓#15284↓0.2514.9 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial80%
$0.13↓#21915↓0.05↓17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rockslide Elemental80%
$0.15↓#23966↓0.47↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Fire Nation Sentinels80%
$0.47↑#16449↓0.00↓0.8 years↓
"Whenever a nontoken creature an opponent controls dies, put a +1/+1 counter on each creature you control."
Kraven the Hunter80%
$0.25↓#14297↓0.47↑1.0 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."
Clickslither80%
$0.27#24807↓0.52↑23.6 years↑
"Haste"
Swarm of Bloodflies80%
$0.09↓#13737↓0.50↑11.9 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
Scavenger Drake80%
$0.18↓#22233↓0.40↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Scarland Thrinax80%
$0.19↓#23518↓0.94↑17.6 years↑
"Sacrifice a creature: Put a +1/+1 counter on this creature."
Bloodflow Connoisseur80%
$0.10↓#8346↓0.00↓14.3 years↑
"Sacrifice a creature: Put a +1/+1 counter on this creature."
Sengir Connoisseur80%
$0.21↓#20360↓0.00↓4.0 years↓
"Whenever one or more other creatures die, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Vampire Warlord80%
$0.10↓#27864↓0.56↑13.1 years↑
"Sacrifice another creature: Regenerate this creature."
Pitiless Pontiff80%
$0.17↓#18597↓0.00↓7.6 years↓
"
, 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."