Magma Pummeler {X}{R}{R}
Creature — Elemental
This creature enters with X +1/+1 counters on it.
If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from it. When one or more counters are removed from this creature this way, it deals that much damage to any target.
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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.
Ugin's Conjurant 88%
$0.14#11378
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from this creature."
+1 more matching line
Polukranos, Unchained 85%
$0.78#11497
"If damage would be dealt to this card while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from it."
Oathsworn Knight 84%
$0.31#18953
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from it."
+1 more matching line
Undergrowth Champion 83%
$0.58#8082
"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage and remove a +1/+1 counter from this creature."
Protean Hydra 82%
$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
Anti-Venom, Horrifying Healer 81%
$6.18#5144
"If damage would be dealt to this card, prevent that damage and put that many +1/+1 counters on him."