Snake Umbra 

Enchantment — Aura
$0.81 #1497 0.20 16.4 years
Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature deals damage to an opponent, you may draw a card."
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)
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Cards similar to Snake Umbra 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.
Ophidian Eye94%
$12.21↑#16330.56↑19.9 years↑
"Whenever enchanted creature deals damage to an opponent, you may draw a card."
+1 more matching line
Keen Sense94%
$2.19↑#2859↓0.1819.6 years↑
"Whenever enchanted creature deals damage to an opponent, you may draw a card."
Sixth Sense93%
$0.33↓#6168↓0.269.4 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, you may draw a card.""
+1 more matching line
Curiosity90%
$0.76↓#585↑0.60↑28.2 years↑
"Whenever enchanted creature deals damage to an opponent, you may draw a card."
Vedalken Heretic89%
$0.65↓#21927↓0.00↓17.3 years
"Whenever this creature deals damage to an opponent, you may draw a card."
Tandem Lookout88%
$0.93↑#2246↓0.2314.3 years↓
"As long as this card is paired with another creature, each of those creatures has "Whenever this creature deals damage to an opponent, draw a card.""
Lu Xun, Scholar General88%
$0.31↓#16940↓0.00↓27.3 years↑
"Whenever this card deals damage to an opponent, you may draw a card."
Thieving Otter88%
$0.12↓#11673↓0.07↓6.4 years↓
"Whenever this creature deals damage to an opponent, draw a card."
Curious Obsession88%
$0.22↓#8565↓0.06↓8.6 years↓
"Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may draw a card.""
+1 more matching line
Mischievous Catgeist // Catlike Curiosity88%
$0.26↓#11872↓0.05↓4.8 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card.""
+1 more matching line
Thieving Magpie88%
$0.09↓#14849↓0.04↓27.2 years↑
"Whenever this creature deals damage to an opponent, draw a card."
Coastal Piracy86%
$0.26↓#15100.2026.9 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Combat Research86%
$0.81#2190↓0.164.0 years↓
"Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card.""
Staggering Insight86%
$0.19↓#5492↓0.266.6 years↓
"Enchanted creature gets +1/+1 and has lifelink and "Whenever this creature deals combat damage to a player, draw a card.""
+1 more matching line
Saltwater Stalwart86%
$0.15↓#26648↓0.278.2 years↓
"Whenever this creature deals damage to an opponent, target player draws a card."
Niv-Mizzet, Dracogenius84%
$0.92↑#9226↓0.83↑13.9 years↓
"Whenever this card deals damage to a player, you may draw a card."
Neurok Commando84%
$0.08↓#18935↓0.1515.6 years
"Whenever this creature deals combat damage to a player, you may draw a card."
+1 more matching line
Rogue's Gloves84%
$0.30↓#4101↓0.1312.1 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
Stealer of Secrets84%
$0.05↓#20654↓0.2413.9 years↓
"Whenever this creature deals combat damage to a player, draw a card."