Retaliator Griffin 
Creature — Griffin
$0.33 #22139 0.14 17.3 years
Flying
Whenever a source an opponent controls deals damage to you, you may put that many +1/+1 counters on this creature.
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Cards similar to Retaliator Griffin 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.
Auntie Blyte, Bad Influence86%
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"Whenever a source you control deals damage to you, put that many +1/+1 counters on this card."
Blood Hound86%
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"Whenever you're dealt damage, you may put that many +1/+1 counters on this creature."
Awaken the Sky Tyrant86%
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"When a source an opponent controls deals damage to you, sacrifice this enchantment. If you do, create a 5/5 red Dragon creature token with flying."
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"Flying"
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"Flying"
Discordant Spirit82%
$0.62↑#31339↓0.00↓29.9 years↑
"At the beginning of each end step, if it's an opponent's turn, put a +1/+1 counter on this creature for each 1 damage dealt to you this turn."
Ravenhill Flock82%
$0.21↓#196320.00↓0.1 years↓
"Flying"
War Elemental82%
$5.01↑#13319↑0.1422.9 years↑
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Pterafractyl81%
$0.16↓#16697↑0.00↓0.4 years↓
"Flying"
Blessed Spirits80%
$0.13↓#206320.00↓11.1 years↓
"Flying"
Donatello, Way with Machines80%
$0.21↓#13634↑0.00↓0.5 years↓
"Flying"
Akroan Skyguard79%
$0.11↓#195040.29↑12.6 years↓
"Flying"
Flameblade Angel78%
$0.30↓#202120.30↑10.4 years↓
"Whenever a source an opponent controls deals damage to you or a permanent you control, you may have this creature deal 1 damage to that source's controller."
+1 more matching line
Umara Raptor78%
$0.14↓#179400.00↓16.9 years
"Flying"
Aurification77%
$6.50↑#14253↑0.35↑23.9 years↑
"Whenever a creature deals damage to you, put a gold counter on it."
Rushwood Elemental77%
$0.98↑#28048↓0.25↑26.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Scrounging Skyray76%
$0.26↓#7337↑0.131.6 years↓
"Flying"
Farsight Mask76%
$0.35↑#15372↑0.44↑22.9 years↑
"Whenever a source an opponent controls deals damage to you, if this artifact is untapped, you may draw a card."
Vorosh, the Hunter76%
$0.73↑#195880.41↑19.6 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
. If you do, put six +1/+1 counters on this card."
Sun Droplet76%
$0.29↓#10618↑0.29↑22.9 years↑
"Whenever you're dealt damage, put that many charge counters on this artifact."