Ageless Entity {3}{G}{G}
Creature — Elemental
Whenever you gain life, put that many +1/+1 counters on this creature.
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Cards that do something similar 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.
Bloodthirsty Aerialist 90%
$0.39#6510
"Whenever you gain life, put a +1/+1 counter on this creature."
Earth Kingdom General 84%
$0.26#5571
"Whenever you put one or more +1/+1 counters on a creature, you may gain that much life. Do this only once each turn."
Hungering Hydra 82%
$2.96#3497
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."