Hungering Hydra 
Creature — Hydra
$2.75 #3647 0.14 8.3 years
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 similar to Hungering Hydra 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.
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"this card can't be blocked by more than one creature."
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"This creature can't be blocked by more than one creature."
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"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
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"Whenever this card is dealt damage for the first time each turn, put that many +1/+1 counters on him."
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"Whenever this card is dealt damage, put that many +1/+1 counters on her."
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"This creature can't be blocked by more than one creature."