Tempered Sliver 
Creature — Sliver
$0.29 #11436 0.31 7.2 years
Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
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Cards similar to Tempered 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.
Fungus Sliver88%
$0.49↑#133660.3319.9 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Vampiric Sliver84%
$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.""
Brood Sliver80%
$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."
Watcher Sliver79%
$0.13↓#18013↓0.2719.9 years↑
"All Sliver creatures get +0/+2."
Synapse Sliver78%
$3.83↑#5789↑0.65↑23.6 years↑
"Whenever a Sliver deals combat damage to a player, its controller may draw a card."
Steelform Sliver77%
$0.39↑#21225↓0.47↑13.1 years↑
"Sliver creatures you control get +0/+1."
Cleaving Sliver77%
$0.23↓#104340.68↑7.2 years
"Sliver creatures you control get +2/+0."
Battle Sliver77%
$0.27↓#17003↓0.4113.1 years↑
"Sliver creatures you control get +2/+0."
Plated Sliver77%
$0.55↑#16013↓0.2723.6 years↑
"All Sliver creatures get +0/+1."
Necropolis Regent76%
$0.40↑#4062↑0.21↓13.9 years↑
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Falkenrath Marauders76%
$0.26↓#16087↓0.20↓14.9 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Slith Predator76%
$0.11↓#28916↓0.00↓22.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker76%
$0.10↓#28099↓0.2422.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster76%
$0.30↑#134650.10↓14.6 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper76%
$0.21↓#25520↓0.06↓14.6 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol76%
$0.08↓#27363↓0.2714.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Blade Sliver76%
$0.27↓#14273↓0.44↑23.6 years↑
"All Sliver creatures get +1/+0."
Bonesplitter Sliver76%
$0.20↓#105060.12↓19.9 years↑
"All Sliver creatures get +2/+0."
Slith Ascendant76%
$0.09↓#25038↓0.2922.9 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Heirs of Stromkirk76%
$0.13↓#23805↓0.2514.3 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."