Synapse Sliver 
Creature — Sliver
$6.08 #5887 0.58 23.7 years
Whenever a Sliver deals combat damage to a player, its controller may draw a card.
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Cards similar to Synapse 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.
Opaline Sliver84%
$2.50↓#10884↓0.94↑20.0 years↓
"All Slivers have "Whenever this permanent becomes the target of a spell an opponent controls, you may draw a card.""
Brood Sliver83%
$4.92↓#52930.6223.7 years
"Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token."
Nine-Tail White Fox82%
$0.22↓#22246↓0.10↓8.3 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Stealer of Secrets82%
$0.05↓#21082↓0.29↓14.0 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Scroll Thief82%
$0.06↓#17346↓0.00↓16.3 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Coastal Piracy82%
$0.29↓#1517↑0.19↓27.0 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Edric, Spymaster of Trest81%
$2.02↓#3466↑0.46↓15.3 years↓
"Whenever a creature deals combat damage to one of your opponents, its controller may draw a card."
Neurok Commando80%
$0.13↓#19219↓0.41↓15.7 years↓
"Whenever this creature deals combat damage to a player, you may draw a card."
Ultimecia, Temporal Threat80%
$0.53↓#7307↓0.671.4 years↓
"Whenever a creature you control deals combat damage to a player, draw a card."
Sea-Dasher Octopus79%
$0.81↓#48110.04↓6.5 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Rogue's Gloves79%
$0.31↓#4162↑0.06↓12.3 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
Reconnaissance Mission78%
$0.39↓#908↑0.21↓6.5 years↓
"Whenever a creature you control deals combat damage to a player, you may draw a card."
Deadeye Brawler78%
$0.25↓#20213↓0.00↓8.8 years↓
"Whenever this creature deals combat damage to a player, if you have the city's blessing, draw a card."
Marchesa's Infiltrator78%
$0.22↓#22548↓0.27↓12.4 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Tempered Sliver78%
$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.""
Sixth Sense78%
$0.33↓#62190.00↓9.5 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, you may draw a card.""
Bident of Thassa77%
$0.46↓#444↑0.29↓13.1 years↓
"Whenever a creature you control deals combat damage to a player, you may draw a card."
Jhessian Thief76%
$0.08↓#19976↓0.13↓11.3 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Jeskai Shrinekeeper76%
$0.21↓#13605↓0.12↓1.5 years↓
"Whenever this creature deals combat damage to a player, you gain 1 life and draw a card."
Illvoi Infiltrator76%
$0.15↓#19171↓0.06↓1.2 years↓
"Whenever this creature deals combat damage to a player, draw a card."