Snapping Sailback 
Creature — Dinosaur
$0.19 #14469 0.29 8.9 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%
$0.19#29045↓0.00↓0.2 years↓
"Whenever this card is dealt damage, put a +1/+1 counter on her."
Siegehorn Ceratops98%
$0.57↑#129680.05↓8.6 years
"Whenever this creature is dealt damage, put two +1/+1 counters on it."
Hungering Hydra96%
$2.63↑#3588↑0.318.1 years
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
Hercules, Olympian Hero96%
$0.29↑#160460.00↓0.2 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%
$0.21↑#163330.00↓0.5 years↓
"Whenever this card is dealt damage, put that many +1/+1 counters on her."
Rite of Passage95%
$4.80↑#5771↑0.05↓22.3 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Fungusaur94%
$0.25↑#23468↓0.3133.1 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Strong, the Brutish Thespian90%
$0.36↑#6137↑0.212.5 years↓
"Whenever this card is dealt damage, you get three rad counters and put three +1/+1 counters on this card."
War Elemental83%
$5.01↑#133190.14↓22.9 years↑
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Fungus Sliver81%
$0.49↑#133660.3319.9 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Adaptive Shimmerer80%
$0.12↓#23169↓0.00↓6.4 years↓
"Flash"
Anafenza, Unyielding Lineage79%
$0.26↑#7799↑0.10↓1.4 years↓
"Flash"
Rushwood Elemental76%
$0.98↑#28048↓0.2526.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Faerie Vandal76%
$0.23↑#5980↑0.53↑6.9 years↓
"Flash"
Bellowing Aegisaur75%
$0.18↓#7939↑0.13↓8.9 years
"Whenever this creature is dealt damage, put a +1/+1 counter on each other creature you control."
Furious Spinesplitter74%
$0.23↑#26896↓0.06↓2.5 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."
Shambleshark74%
$0.20↑#20561↓0.2913.6 years↑
"Flash"
Brineborn Cutthroat74%
$0.18↓#10381↑0.12↓7.2 years↓
"Flash"
Whirling Dervish72%
$0.27↑#28920↓0.3732.3 years↑
"At the beginning of each end step, if this creature dealt damage to an opponent this turn, put a +1/+1 counter on it."
Child of the Volcano72%
$0.10↓#22835↓0.46↑2.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."