Bloodthirsty Aerialist 
Creature — Vampire Rogue
$0.18 #6835 0.07 7.3 years
Flying
Whenever you gain life, put a +1/+1 counter on this creature.
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Cards similar to Bloodthirsty Aerialist 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↓#17496↓0.006.1 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Blood Researcher100%
$0.17↓#16369↓0.35↑5.5 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn100%
$0.19↑#9265↓0.32↑5.2 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot100%
$0.16↓#9176↓0.090.5 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire100%
$0.25↑#13658↓0.1211.0 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury100%
$0.19↑#17069↓0.18↑0.3 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star100%
$0.23↑#15593↓0.30↑1.1 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Exemplar of Light96%
$0.91↑#1124↑0.32↑1.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Ajani's Pridemate96%
$0.19↑#2529↑0.29↑16.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Unflinching Hortimancer95%
$0.23↑#21620↓0.040.0 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Vampire Scrivener95%
$0.16↓#13868↓0.29↑4.5 years↓
"Whenever you gain life during your turn, put a +1/+1 counter on this creature."
Twinblade Paladin94%
$0.38↑#12033↓0.007.3 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Cleric of Life's Bond94%
$0.24↑#13768↓0.006.1 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↑#73430.141.9 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↑0.31↑1.4 years↓
"Whenever you gain life, put a charge counter on this card."
Serene Steward93%
$0.09↓#19687↓0.0011.0 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↑0.164.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Titanbones, Towering Heart92%
$0.20↑#19743↓0.060.0 years↓
"Whenever you gain life, put two +1/+1 counters on this card."
Aerith Gainsborough90%
$2.04↑#2072↑0.25↑1.4 years↓
"Whenever you gain life, put a +1/+1 counter on this card."