Bloodthirsty Aerialist 
Creature — Vampire Rogue
$0.18 #6691 0.46 7.2 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↓#17244↓0.25↓5.9 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Blood Researcher100%
$0.18#16018↓0.06↓5.4 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn100%
$0.23↑#9235↓0.07↓5.1 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire100%
$0.25↑#13533↓0.30↓10.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot100%
$0.25↑#9655↓0.00↓0.4 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury100%
$0.22↑#18644↓0.00↓0.2 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star100%
$0.23↑#15820↓0.08↓0.9 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Exemplar of Light96%
$0.75↑#1245↑0.31↓1.8 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Ajani's Pridemate96%
$0.17↓#2591↑0.21↓16.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Vampire Scrivener95%
$0.18#13767↓0.474.4 years↓
"Whenever you gain life during your turn, put a +1/+1 counter on this creature."
Cleric of Life's Bond94%
$0.25↑#13544↓0.29↓5.9 years↓
"Whenever you gain life for the first time each turn, put a +1/+1 counter on this creature."
Twinblade Paladin94%
$0.36↑#12041↓0.457.2 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate94%
$0.38↑#75860.09↓1.8 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Elenda's Hierophant93%
$4.91↑#1872↑0.25↓2.8 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Excalibur II93%
$0.70↑#4735↑0.22↓1.2 years↓
"Whenever you gain life, put a charge counter on this card."
Voice of the Blessed92%
$1.96↑#3108↑0.33↓4.8 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Serene Steward92%
$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."
Aerith Gainsborough90%
$3.31↑#2214↑0.31↓1.2 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Archangel of Thune90%
$17.32↑#1395↑0.59↑13.1 years↑
"Whenever you gain life, put a +1/+1 counter on each creature you control."
Wall of Limbs88%
$0.22↑#11950↓0.35↓12.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."