Snapping Sailback 
Creature — Dinosaur
$0.19 #14627 0.06 9.1 years
Flash
Enrage — Whenever this creature is dealt damage, put a +1/+1 counter on it. (It must survive the damage to get the counter.)
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Cards similar to Snapping Sailback 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.
Mockingbird, Bobbi Morse100%
$0.17↓#28283↓0.26↑0.3 years↓
"Whenever this card is dealt damage, put a +1/+1 counter on her."
Siegehorn Ceratops98%
$0.53↑#129720.40↑8.8 years
"Whenever this creature is dealt damage, put two +1/+1 counters on it."
Hungering Hydra96%
$2.75↑#3647↑0.148.3 years
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
Hercules, Olympian Hero96%
$0.30↑#150570.38↑0.3 years↓
"Whenever this card is dealt damage for the first time each turn, put that many +1/+1 counters on him."
Venus, Torn Between Worlds96%
$0.26↑#160840.46↑0.6 years↓
"Whenever this card is dealt damage, put that many +1/+1 counters on her."
Rite of Passage95%
$4.95↑#5725↑0.28↑22.4 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Fungusaur94%
$0.31↑#23715↓0.0533.2 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Strong, the Brutish Thespian90%
$0.36↑#6243↑0.22↑2.6 years↓
"Whenever this card is dealt damage, you get three rad counters and put three +1/+1 counters on this card."
War Elemental82%
$5.18↑#135540.0023.0 years↑
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Fungus Sliver82%
$0.57↑#134160.29↑20.0 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Bruce Banner // The Incredible Hulk80%
$3.02↑#9417↑0.78↑0.3 years↓
"Whenever this card is dealt damage, put a +1/+1 counter on him. If he's attacking, untap him and there is an additional combat phase after this phase."
Adaptive Shimmerer79%
$0.10↓#23305↓0.22↑6.5 years↓
"Flash"
Anafenza, Unyielding Lineage78%
$0.23↑#7682↑0.17↑1.5 years↓
"Flash"
Rushwood Elemental76%
$1.04↑#28334↓0.0027.0 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Bellowing Aegisaur75%
$0.15↓#7982↑0.17↑9.1 years
"Whenever this creature is dealt damage, put a +1/+1 counter on each other creature you control."
Faerie Vandal74%
$0.23↑#6056↑0.127.0 years↓
"Flash"
Furious Spinesplitter74%
$0.22↑#27221↓0.072.7 years↓
"At the beginning of your end step, put a +1/+1 counter on this creature for each opponent who was dealt damage this turn."
Illusory Ambusher74%
$0.15↓#11497↑0.26↑10.9 years↑
"Flash"
Shambleshark73%
$0.21↑#20123↓0.0013.7 years↑
"Flash"
Child of the Volcano72%
$0.12↓#23322↓0.062.9 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."