Sengir, the Dark Baron 
Legendary Creature — Vampire Noble
$0.28 #11001 0.25 5.8 years
Flying
Whenever another creature dies, put two +1/+1 counters on Sengir.
Whenever another player loses the game, you gain life equal to that player's life total as the turn began.
Partner (You can have two commanders if both have partner.)
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Cards similar to Sengir, the Dark Baron 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 dies, put a +1/+1 counter on this creature."
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$0.18↓#22233↓0.40↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
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$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."
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"Whenever a creature dies, put a +1/+1 counter on this creature."
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"Whenever another creature dies, you may put a +1/+1 counter on this creature."
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$0.15↓#23966↓0.47↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
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$0.11↓#24342↓0.50↑5.2 years
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gorma, the Gullet83%
$0.74↑#7698↑0.00↓0.4 years↓
"Whenever another creature you control dies, put a +1/+1 counter on this card."
Thanos, Death's Consort82%
$2.20↑#18354↓0.00↓0.2 years↓
"Whenever another creature dies, put a +1/+1 counter on this card."
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$0.17↓#13578↓0.00↓10.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
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"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gavony Unhallowed82%
$0.08↓#19717↓0.87↑10.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Slurrk, All-Ingesting82%
$0.29↑#96710.41↑5.8 years
"Whenever this card or another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on each creature you control that has a +1/+1 counter on it."
+1 more matching line
Vengeful Townsfolk82%
$0.12↓#20367↓0.332.4 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."
Pterafractyl81%
$0.16↓#16697↓0.00↓0.4 years↓
"Flying"
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$0.91↑#98710.223.9 years↓
"Whenever another creature dies, put a +1/+1 counter on this creature."
Keleth, Sunmane Familiar78%
$0.21↓#6749↑0.00↓5.8 years
"Partner"
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$0.27↓#8134↑0.325.8 years
"Partner"