Fungus Sliver 
Creature — Fungus Sliver
$0.49 #13366 0.33 19.9 years
All Sliver creatures have "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 Fungus Sliver 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.
Tempered Sliver88%
$0.29↓#114360.317.2 years↓
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.""
Vampiric Sliver86%
$1.23↑#20775↓0.2519.9 years
"All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.""
Rite of Passage86%
$4.80↑#5771↑0.05↓22.3 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Snapping Sailback81%
$0.19↓#144690.298.9 years↓
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Mockingbird, Bobbi Morse80%
$0.19↓#29045↓0.00↓0.2 years↓
"Whenever this card is dealt damage, put a +1/+1 counter on her."
Watcher Sliver80%
$0.13↓#18013↓0.2719.9 years
"All Sliver creatures get +0/+2."
Siegehorn Ceratops78%
$0.57↑#129680.05↓8.6 years↓
"Whenever this creature is dealt damage, put two +1/+1 counters on it."
Blade Sliver76%
$0.27↓#142730.44↑23.6 years↑
"All Sliver creatures get +1/+0."
Plated Sliver76%
$0.55↑#160130.2723.6 years↑
"All Sliver creatures get +0/+1."
Bonesplitter Sliver76%
$0.20↓#10506↑0.12↓19.9 years
"All Sliver creatures get +2/+0."
Hercules, Olympian Hero75%
$0.29↓#16046↓0.00↓0.2 years↓
"Whenever this card is dealt damage for the first time each turn, put that many +1/+1 counters on him."
Hungering Hydra74%
$2.63↑#3588↑0.318.1 years↓
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
Venus, Torn Between Worlds74%
$0.21↓#16333↓0.00↓0.5 years↓
"Whenever this card is dealt damage, put that many +1/+1 counters on her."
Spiteful Sliver72%
$2.07↑#4756↑0.64↑7.2 years↓
"Sliver creatures you control have "Whenever this creature is dealt damage, it deals that much damage to target player or planeswalker.""
Might Sliver72%
$0.43↓#7379↑0.2719.9 years
"All Sliver creatures get +2/+2."
Fungusaur72%
$0.25↓#23468↓0.3133.1 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Sinew Sliver72%
$0.43↓#5282↑0.3419.6 years
"All Sliver creatures get +1/+1."
Muscle Sliver72%
$0.76↑#6261↑0.58↑28.9 years↑
"All Sliver creatures get +1/+1."
Brood Sliver70%
$5.02↑#5229↑0.3923.6 years↑
"Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token."
Steelform Sliver70%
$0.39↓#21225↓0.47↑13.1 years↓
"Sliver creatures you control get +0/+1."