Sengir, the Dark Baron {4}{B}{B}
Legendary Creature — Vampire Noble
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 that do something similar 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.
Ondu Knotmaster // Throw a Line 87%
$0.17#19402
"Whenever another modified creature you control dies, put two +1/+1 counters on this creature."
+1 more matching line
Kresh the Bloodbraided 87%
$0.89#9065
"Whenever another creature dies, you may put X +1/+1 counters on Kresh, where X is that creature's power."
Shay Cormac 86%
$0.36#3847
"Whenever a creature with a bounty counter on it dies, put two +1/+1 counters on this card."