Aerith Gainsborough 
Legendary Creature — Human Cleric
$2.04 #2072 0.25 1.4 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%
$0.91↓#1124↑0.321.9 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Tigra, Feline Fury91%
$0.19↓#17069↓0.180.3 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star91%
$0.23↓#15593↓0.301.1 years
"Whenever you gain life, put a +1/+1 counter on this card."
Celestial Unicorn91%
$0.19↓#9265↓0.325.2 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot91%
$0.16↓#9176↓0.09↓0.5 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire91%
$0.25↓#13658↓0.12↓11.0 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Scion of the Swarm90%
$0.11↓#17496↓0.00↓6.1 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodthirsty Aerialist90%
$0.18↓#6835↓0.07↓7.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Blood Researcher90%
$0.17↓#16369↓0.355.5 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Qala, Ajani's Pridemate88%
$0.38↓#7343↓0.14↓1.9 years
"Whenever you gain life, put a +1/+1 counter on this card."
Voice of the Blessed88%
$0.97↓#2976↓0.164.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
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."
Cleric of Life's Bond86%
$0.24↓#13768↓0.00↓6.1 years↑
"Whenever you gain life for the first time each turn, 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."
Arcbound Mouser86%
$0.18↓#8532↓0.00↓5.3 years↑
"Lifelink"
Elenda's Hierophant85%
$3.50↑#18380.222.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
+1 more matching line
Leonardo, Cutting Edge84%
$0.95↓#9038↓0.41↑0.6 years
"Whenever you gain life, put a +1/+1 counter on this card."
+1 more matching line
Ajani's Pridemate84%
$0.19↓#2529↓0.2916.3 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Archangel of Thune84%
$17.99↑#1284↑0.59↑13.3 years↑
"Whenever you gain life, put a +1/+1 counter on each creature you control."
+1 more matching line
The Destined White Mage84%
$13.66↑#9616↓0.260.9 years
"Lifelink"