Blood Researcher 
Creature — Vampire Druid
$0.17 #16369 0.35 5.5 years
Menace (This creature can't be blocked except by two or more creatures.)
Whenever you gain life, put a +1/+1 counter on this creature.
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Cards similar to Blood Researcher 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.
Scion of the Swarm100%
$0.11↓#174960.00↓6.1 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodthirsty Aerialist100%
$0.18↑#6835↑0.07↓7.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn100%
$0.19↑#9265↑0.325.2 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot100%
$0.16↓#9176↑0.09↓0.5 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire100%
$0.25↑#136580.12↓11.0 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury100%
$0.19↑#170690.18↓0.3 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star100%
$0.23↑#155930.301.1 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Exemplar of Light96%
$0.91↑#1124↑0.321.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Ajani's Pridemate96%
$0.19↑#2529↑0.2916.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Unflinching Hortimancer95%
$0.23↑#21620↓0.04↓0.0 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Vampire Scrivener95%
$0.16↓#138680.294.5 years↓
"Whenever you gain life during your turn, put a +1/+1 counter on this creature."
Twinblade Paladin94%
$0.38↑#12033↑0.00↓7.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Cleric of Life's Bond94%
$0.24↑#137680.00↓6.1 years
"Whenever you gain life for the first time each turn, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate94%
$0.38↑#7343↑0.14↓1.9 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Elenda's Hierophant93%
$3.50↑#1838↑0.22↓2.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Excalibur II93%
$1.18↑#4490↑0.311.4 years↓
"Whenever you gain life, put a charge counter on this card."
Serene Steward93%
$0.09↓#19687↓0.00↓11.0 years↑
"Whenever you gain life, you may pay 
. If you do, put a +1/+1 counter on target creature."
. If you do, put a +1/+1 counter on target creature."
Voice of the Blessed92%
$0.97↑#2976↑0.16↓4.9 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Titanbones, Towering Heart92%
$0.20↑#19743↓0.06↓0.0 years↓
"Whenever you gain life, put two +1/+1 counters on this card."
Aerith Gainsborough90%
$2.04↑#2072↑0.251.4 years↓
"Whenever you gain life, put a +1/+1 counter on this card."