Synapse Sliver 
Creature — Sliver
$3.83 #5789 0.65 23.6 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%
$2.05↓#10654↓0.50↓19.9 years↓
"All Slivers have "Whenever this permanent becomes the target of a spell an opponent controls, you may draw a card.""
Brood Sliver83%
$5.02↑#52290.39↓23.6 years
"Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token."
Stealer of Secrets82%
$0.05↓#20654↓0.24↓13.9 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Scroll Thief82%
$0.06↓#17095↓0.36↓16.1 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Nine-Tail White Fox82%
$0.21↓#22046↓0.31↓8.2 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Neurok Commando82%
$0.08↓#18935↓0.15↓15.6 years↓
"Whenever this creature deals combat damage to a player, you may draw a card."
Coastal Piracy82%
$0.26↓#1510↑0.20↓26.9 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Edric, Spymaster of Trest82%
$1.66↓#3413↑0.49↓15.2 years↓
"Whenever a creature deals combat damage to one of your opponents, its controller may draw a card."
Sea-Dasher Octopus81%
$0.80↓#47210.18↓6.4 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Ultimecia, Temporal Threat80%
$0.43↓#7547↓0.571.2 years↓
"Whenever a creature you control deals combat damage to a player, draw a card."
Rogue's Gloves79%
$0.30↓#4101↑0.13↓12.1 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
Reconnaissance Mission78%
$0.31↓#892↑0.15↓6.4 years↓
"Whenever a creature you control deals combat damage to a player, you may draw a card."
Tempered Sliver78%
$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.""
Deadeye Brawler78%
$0.28↓#19807↓0.33↓8.6 years↓
"Whenever this creature deals combat damage to a player, if you have the city's blessing, draw a card."
Sixth Sense78%
$0.33↓#61680.26↓9.4 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, you may draw a card.""
Marchesa's Infiltrator78%
$0.23↓#22216↓0.33↓12.2 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Bident of Thassa77%
$0.41↓#429↑0.31↓13.0 years↓
"Whenever a creature you control deals combat damage to a player, you may draw a card."
Mischievous Catgeist // Catlike Curiosity76%
$0.26↓#11872↓0.05↓4.8 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Jhessian Thief76%
$0.12↓#19595↓0.00↓11.1 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Jeskai Shrinekeeper76%
$0.22↓#13623↓0.18↓1.4 years↓
"Whenever this creature deals combat damage to a player, you gain 1 life and draw a card."