Protean Hydra 
Creature — Hydra
$4.24 #6637 0.52 17.3 years
This creature enters with X +1/+1 counters on it.
If damage would be dealt to this creature, prevent that damage and remove that many +1/+1 counters from it.
Whenever a +1/+1 counter is removed from this creature, put two +1/+1 counters on it at the beginning of the next end step.
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Cards similar to Protean 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.
Phantom Nantuko98%
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"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Phantom Tiger97%
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"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Phantom Nomad97%
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"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Phantom Wurm97%
$0.13↓#23839↓0.12↓20.0 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Phantom Flock97%
$0.04↓#23361↓0.00↓24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Ugin's Conjurant97%
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"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."
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Undergrowth Champion96%
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"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."
Phantom Centaur95%
$0.15↓#27284↓0.17↓24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Oathsworn Knight95%
$0.19↓#19708↓0.20↓7.0 years↓
"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
Rock Hydra95%
$1.00↓#27908↓0.6233.2 years↑
"For each 1 damage that would be dealt to this creature, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage."
+1 more matching line
Unbreathing Horde92%
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"If this creature would be dealt damage, prevent that damage and remove a +1/+1 counter from it."
Phantom Nishoba90%
$0.25↓#14448↓0.06↓24.4 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
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Bloatfly Swarm90%
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"If damage would be dealt to this creature while it has a +1/+1 counter on it, prevent that damage, remove that many +1/+1 counters from it, then give each player a rad counter for each +1/+1 counter removed this way."
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Polukranos, Unchained86%
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"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."
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Sekki, Seasons' Guide85%
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"If damage would be dealt to this card, prevent that damage, remove that many +1/+1 counters from this card, and create that many 1/1 colorless Spirit creature tokens."
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Balduvian Hydra84%
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"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
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Ironscale Hydra80%
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"If a creature would deal combat damage to this creature, prevent that damage and put a +1/+1 counter on this creature."
Anti-Venom, Horrifying Healer80%
$6.31↑#4423↑0.89↑1.1 years↓
"If damage would be dealt to this card, prevent that damage and put that many +1/+1 counters on him."