Vampire Scrivener 
Creature — Vampire Warlock
$0.16 #13868 0.29 4.5 years
Flying
Whenever you gain life during your turn, put a +1/+1 counter on this creature.
Whenever you lose life during your turn, put a +1/+1 counter on this creature.
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Cards similar to Vampire Scrivener 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.
Vengeful Warchief96%
$0.28↑#24993↓0.00↓7.3 years↑
"Whenever you lose life for the first time each turn, put a +1/+1 counter on this creature."
Scion of the Swarm95%
$0.11↓#17496↓0.00↓6.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodthirsty Aerialist95%
$0.18↑#6835↑0.07↓7.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Blood Researcher95%
$0.17↑#163690.355.5 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn94%
$0.19↑#9265↑0.325.2 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot94%
$0.16#9176↑0.09↓0.5 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire94%
$0.25↑#136580.12↓11.0 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury94%
$0.19↑#17069↓0.18↓0.3 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star94%
$0.23↑#155930.301.1 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Essence Channeler92%
$0.42↑#4089↑0.192.2 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Exemplar of Light89%
$0.91↑#1124↑0.321.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Serene Steward88%
$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."
Wax-Wane Witness88%
$0.14↓#139260.00↓2.2 years↓
"Whenever you gain or lose life during your turn, this creature gets +1/+0 until end of turn."
Ajani's Pridemate88%
$0.19↑#2529↑0.2916.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Cleric of Life's Bond87%
$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."
Unflinching Hortimancer86%
$0.23↑#21620↓0.04↓0.0 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Excalibur II86%
$1.18↑#4490↑0.311.4 years↓
"Whenever you gain life, put a charge counter on this card."
Twinblade Paladin86%
$0.38↑#120330.00↓7.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate86%
$0.38↑#7343↑0.14↓1.9 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Elenda's Hierophant85%
$3.50↑#1838↑0.222.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."