Tempered Sliver 
Creature — Sliver
$0.32 #11641 0.35 7.4 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 Sliver89%
$0.57↑#134160.2920.0 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Vampiric Sliver84%
$1.05↑#21016↓0.06↓20.0 years↑
"All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.""
Slith Predator80%
$0.11↓#29138↓0.00↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker80%
$0.16↓#28345↓0.11↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster80%
$0.31↓#135680.00↓14.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper80%
$0.20↓#25789↓0.07↓14.7 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol80%
$0.05↓#27692↓0.12↓15.1 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Brood Sliver80%
$4.92↑#5293↑0.62↑23.7 years↑
"Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token."
Falkenrath Marauders80%
$0.26↓#16274↓0.00↓15.1 years↑
"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."
Heirs of Stromkirk79%
$0.11↓#24144↓0.3814.5 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant79%
$0.07↓#25371↓0.00↓23.0 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Watcher Sliver78%
$0.16↓#18162↓0.2920.0 years↑
"All Sliver creatures get +0/+2."
Synapse Sliver78%
$6.08↑#5887↑0.58↑23.7 years↑
"Whenever a Sliver deals combat damage to a player, its controller may draw a card."
Necropolis Regent78%
$0.44↑#4135↑0.19↓14.0 years↑
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Havengul Vampire78%
$0.13↓#21584↓0.19↓14.5 years↑
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Cleaving Sliver76%
$0.25↓#107070.07↓7.4 years
"Sliver creatures you control get +2/+0."
Battle Sliver76%
$0.34↑#17350↓0.73↑13.3 years↑
"Sliver creatures you control get +2/+0."
Briar Hydra76%
$0.31↓#130700.13↓4.1 years↓
"Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control."
Steelform Sliver76%
$0.31↓#21475↓0.3313.3 years↑
"Sliver creatures you control get +0/+1."
Plated Sliver76%
$0.36↑#16165↓0.00↓23.7 years↑
"All Sliver creatures get +0/+1."