Aerith Gainsborough 
Legendary Creature — Human Cleric
$3.31 #2214 0.31 1.2 years
Lifelink
Whenever you gain life, put a +1/+1 counter on Aerith Gainsborough.
When Aerith Gainsborough dies, put X +1/+1 counters on each legendary creature you control, where X is the number of +1/+1 counters on Aerith Gainsborough.
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Cards similar to Aerith Gainsborough 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.
Exemplar of Light92%
$0.75↓#1245↑0.311.8 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury92%
$0.22↓#18644↓0.00↓0.2 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star92%
$0.23↓#15820↓0.08↓0.9 years
"Whenever you gain life, put a +1/+1 counter on this card."
Celestial Unicorn92%
$0.23↓#9235↓0.07↓5.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire92%
$0.25↓#13533↓0.3010.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot92%
$0.25↓#9655↓0.00↓0.4 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Blood Researcher90%
$0.18↓#16018↓0.06↓5.4 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Scion of the Swarm90%
$0.11↓#17244↓0.255.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodthirsty Aerialist90%
$0.18↓#6691↓0.46↑7.2 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate88%
$0.38↓#7586↓0.09↓1.8 years
"Whenever you gain life, put a +1/+1 counter on this card."
Voice of the Blessed87%
$1.96↓#3108↓0.334.8 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Cleric of Life's Bond87%
$0.25↓#13544↓0.295.9 years↑
"Whenever you gain life for the first time each turn, put a +1/+1 counter on this creature."
Excalibur II86%
$0.70↓#4735↓0.221.2 years
"Whenever you gain life, put a charge counter on this card."
Arcbound Mouser86%
$0.26↓#8397↓0.00↓5.2 years↑
"Lifelink"
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."
Leonardo, Cutting Edge85%
$0.92↓#9679↓0.00↓0.5 years
"Whenever you gain life, put a +1/+1 counter on this card."
+1 more matching line
Elenda's Hierophant85%
$4.91↑#18720.252.8 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Ajani's Pridemate84%
$0.17↓#25910.21↓16.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Archangel of Thune84%
$17.32↑#1395↑0.59↑13.1 years↑
"Whenever you gain life, put a +1/+1 counter on each creature you control."
+1 more matching line
Essence Channeler84%
$0.50↓#4029↓0.00↓2.1 years
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line