Sengir Connoisseur 
Creature — Vampire
$0.21 #20360 0.00 4.0 years
Flying
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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Cards similar to Sengir Connoisseur 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.
Swarm of Bloodflies100%
$0.09↓#13737↑0.50↑11.9 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
Scavenger Drake100%
$0.18↓#222330.40↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
+1 more matching line
Lumberknot98%
$0.11↓#15284↑0.25↑14.9 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial98%
$0.13↓#219150.0517.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rockslide Elemental98%
$0.15↓#239660.47↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Guardian Kirin98%
$0.11↓#243420.50↑5.2 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Vengeful Townsfolk97%
$0.12↓#203670.33↑2.4 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."
Gavony Unhallowed97%
$0.08↓#197170.87↑10.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Rot Shambler97%
$0.17↓#13578↑0.0010.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob97%
$0.08↓#178580.0014.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Thanos, Death's Consort96%
$2.20↑#183540.000.2 years↓
"Whenever another creature dies, put a +1/+1 counter on this card."
Voracious Vermin94%
$0.37↑#6029↑0.19↑3.0 years
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Judge Magister Gabranth93%
$0.17↓#9191↑0.27↑1.2 years↓
"Whenever another creature or artifact you control dies, put a +1/+1 counter on this card."
Mausoleum Harpy93%
$0.04↓#29123↓0.19↑8.6 years↑
"Whenever another creature you control dies, if you have the city's blessing, put a +1/+1 counter on this creature."
Aven Sunstriker92%
$0.24↑#177150.0011.4 years↑
"Flying"
Soulcatcher91%
$0.24↑#14180↑0.47↑24.9 years↑
"Whenever a creature with flying dies, put a +1/+1 counter on this creature."
Venomcrawler90%
$0.91↑#9871↑0.22↑3.9 years
"Whenever another creature dies, put a +1/+1 counter on this creature."
Rising Populace90%
$0.04↓#222030.22↑7.3 years↑
"Whenever another creature or planeswalker you control dies, put a +1/+1 counter on this creature."
Moriok Rigger88%
$0.50↑#239810.0622.3 years↑
"Whenever an artifact is put into a graveyard from the battlefield, you may put a +1/+1 counter on this creature."
Havengul Vampire88%
$0.14↓#213360.25↑14.3 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."