Light of Promise 
Enchantment — Aura
$0.45 #4420 0.45 6.2 years
Enchant creature
Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature."
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Cards similar to Light of Promise 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.
Sunbond100%
$0.56↑#8600↓0.4712.6 years↑
"Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature.""
Ageless Entity88%
$0.31↓#14668↓0.22↓22.6 years↑
"Whenever you gain life, put that many +1/+1 counters on this creature."
Cradle of Vitality86%
$0.45#12446↓0.4117.9 years↑
"Whenever you gain life, you may pay 
. If you do, put a +1/+1 counter on target creature for each 1 life you gained."
. If you do, put a +1/+1 counter on target creature for each 1 life you gained."
Nykthos Paragon84%
$0.68↑#2955↑0.33↓5.3 years
"Whenever you gain life, you may put that many +1/+1 counters on each creature you control. Do this only once each turn."
Serene Steward76%
$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."
Forced Adaptation75%
$0.17↓#8317↓0.5013.6 years↑
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature."
+1 more matching line
Tigra, Feline Fury74%
$0.22↓#18644↓0.00↓0.2 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
MJ, Rising Star74%
$0.23↓#15820↓0.08↓0.9 years↓
"Whenever you gain life, put a +1/+1 counter on this card."
Blood Researcher74%
$0.18↓#16018↓0.06↓5.4 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Scion of the Swarm74%
$0.11↓#17244↓0.25↓5.9 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Celestial Unicorn74%
$0.23↓#9235↓0.07↓5.1 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodthirsty Aerialist74%
$0.18↓#6691↓0.467.2 years
"Whenever you gain life, put a +1/+1 counter on this creature."
Bloodbond Vampire74%
$0.25↓#13533↓0.30↓10.9 years↑
"Whenever you gain life, put a +1/+1 counter on this creature."
Pest Mascot74%
$0.25↓#9655↓0.00↓0.4 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Heliod, Sun-Crowned73%
$19.86↑#1039↑0.90↑6.6 years
"Whenever you gain life, put a +1/+1 counter on target creature or enchantment you control."
Exemplar of Light70%
$0.75↑#1245↑0.31↓1.8 years↓
"Whenever you gain life, put a +1/+1 counter on this creature."
Archangel of Thune70%
$17.32↑#1395↑0.59↑13.1 years↑
"Whenever you gain life, put a +1/+1 counter on each creature you control."