Hungering Hydra {X}{G}
Creature — Hydra
This creature enters with X +1/+1 counters on it.
This creature can't be blocked by more than one creature.
Whenever this creature is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)
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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.
Blood Hound 94%
$0.53#24037
"Whenever you're dealt damage, you may put that many +1/+1 counters on this creature."
Phytohydra 87%
$0.35#13150
"If damage would be dealt to this creature, put that many +1/+1 counters on it instead."
Snapping Sailback 85%
$0.22#14168
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Hidetsugu Consumes All // Vessel of the All-Consuming 85%
$0.60#13750
"Whenever this creature deals damage, put a +1/+1 counter on it."
Selfless Squire 85%
$0.39#2492
"Whenever damage that would be dealt to you is prevented, put that many +1/+1 counters on this creature."
Ageless Entity 82%
$0.33#14501
"Whenever you gain life, put that many +1/+1 counters on this creature."
Conclave Sledge-Captain 80%
$1.76#7205
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Westgate Regent 80%
$0.31#13389
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Protean Hydra 80%
$4.47#6344
"If damage would be dealt to this creature, prevent that damage and remove that many +1/+1 counters from it."
+1 more matching line
Kessig Prowler // Sinuous Predator 100%
$0.18#21874
"This creature can't be blocked by more than one creature."