Protean Hydra 
Creature — Hydra
$4.51 #6501 0.18 17.1 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 Nomad97%
$0.21↓#26406↓0.00↓24.3 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 Wurm97%
$0.14↓#23385↓0.43↑19.9 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Phantom Flock97%
$0.06↓#23053↓0.00↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Ugin's Conjurant97%
$0.19↓#11664↓0.257.3 years↓
"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%
$0.38↓#8301↓0.42↑10.9 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 this creature."
Phantom Centaur95%
$0.13↓#27024↓0.56↑24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Oathsworn Knight95%
$0.19↓#19424↓0.246.9 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↓#27606↓0.1933.1 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
Phantom Tiger94%
$0.16↓#23011↓0.06↓24.3 years↑
"If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature."
+1 more matching line
Unbreathing Horde92%
$0.26↓#8314↓0.67↑14.9 years↓
"If this creature would be dealt damage, prevent that damage and remove a +1/+1 counter from it."
Phantom Nishoba90%
$0.25↓#14072↓0.1724.3 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%
$4.20↓#53050.45↑2.5 years↓
"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."
+1 more matching line
Polukranos, Unchained87%
$0.74↓#11827↓0.29↑6.6 years↓
"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."
+1 more matching line
Sekki, Seasons' Guide85%
$1.61↓#18327↓0.2721.3 years↑
"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."
+1 more matching line
Balduvian Hydra84%
$1.13↓#29358↓0.00↓31.3 years↑
"Remove a +1/+0 counter from this creature: Prevent the next 1 damage that would be dealt to it this turn."
+1 more matching line
Knight of Wundagore82%
$0.09↓#21078↓0.00↓0.2 years↓
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Botanical Brawler82%
$0.32↓#67580.273.4 years↓
"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."
+1 more matching line
Anti-Venom, Horrifying Healer80%
$6.51↑#4709↑1.01↑1.0 years↓
"If damage would be dealt to this card, prevent that damage and put that many +1/+1 counters on him."
Ironscale Hydra80%
$0.62↓#8878↓0.33↑6.6 years↓
"If a creature would deal combat damage to this creature, prevent that damage and put a +1/+1 counter on this creature."