Vampire Scrivener 
Creature — Vampire Warlock
$0.18 #13767 0.47 4.4 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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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%
$0.24↑#24701↓0.387.2 years↑
"Whenever you lose life for the first time each turn, put a +1/+1 counter on this creature."
Blood Researcher95%
$0.18#160180.06↓5.4 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Scion of the Swarm95%
$0.11↓#17244↓0.25↓5.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Bloodthirsty Aerialist95%
$0.18#6691↑0.467.2 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot94%
$0.25↑#9655↑0.00↓0.4 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn94%
$0.23↑#9235↑0.07↓5.1 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire94%
$0.25↑#135330.30↓10.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury94%
$0.22↑#18644↓0.00↓0.2 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star94%
$0.23↑#158200.08↓0.9 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Essence Channeler92%
$0.50↑#4029↑0.00↓2.1 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Exemplar of Light89%
$0.75↑#1245↑0.31↓1.8 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Wax-Wane Witness88%
$0.18#134820.00↓2.1 years↓
"Whenever you gain or lose life during your turn, this creature gets +1/+0 until end of turn."
Ajani's Pridemate88%
$0.17↓#2591↑0.21↓16.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Cleric of Life's Bond87%
$0.25↑#135440.29↓5.9 years↑
"Whenever you gain life for the first time each turn, put a +1/+1 counter on this creature."
Excalibur II86%
$0.70↑#4735↑0.22↓1.2 years↓
"Whenever you gain life, put a charge counter on this card."
Serene Steward86%
$0.13↓#19425↓0.00↓10.9 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."
Starlit Soothsayer86%
$0.19↑#10966↑0.06↓2.1 years↓
"Flying"
Twinblade Paladin86%
$0.36↑#120410.457.2 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate86%
$0.38↑#7586↑0.09↓1.8 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Elenda's Hierophant85%
$4.91↑#1872↑0.25↓2.8 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."