Mask of Memory 
Artifact — Equipment
$0.35 #988 0.13 22.9 years
Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Mask of Memory 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.
Zephyr Boots86%
$0.40↑#4493↓0.205.4 years↓
"Whenever equipped creature deals combat damage to a player, draw a card, then discard a card."
+1 more matching line
Rogue's Gloves85%
$0.30↓#4101↓0.1312.1 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
+1 more matching line
Tomebound Lich85%
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"Whenever this creature enters or deals combat damage to a player, draw a card, then discard a card."
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$0.26↓#8744↓0.35↑10.4 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card. If you do, discard a card."
+1 more matching line
April, Reporter of the Weird82%
$0.21↓#19009↓0.00↓0.5 years↓
"Whenever this card deals combat damage to a player, draw that many cards, then discard a card."
Abomination of Gudul80%
$0.05↓#27440↓0.38↑11.9 years↓
"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
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"Whenever this card deals combat damage to a player, draw a card, then discard a card."
Mask of Riddles78%
$0.48↑#7395↓0.0717.3 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
+1 more matching line
Daring Saboteur78%
$0.08↓#10986↓0.36↑8.9 years↓
"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
Suspicious Stowaway // Seafaring Werewolf78%
$0.21↓#16247↓0.27↑4.9 years↓
"Whenever this creature deals combat damage to a player, draw a card, then discard a card."
Assassin Gauntlet77%
$0.36↑#5449↓0.68↑2.2 years↓
"Equipped creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, draw a card, then discard a card.""
+1 more matching line
Jeskai Elder77%
$0.03↓#18548↓0.0712.0 years↓
"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
Coastal Piracy77%
$0.26↓#1510↓0.2026.9 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Acquisition Octopus76%
$0.15↓#10744↓0.044.5 years↓
"Whenever this creature or equipped creature deals combat damage to a player, draw a card."
Arm-Mounted Anchor76%
$0.20↓#12350↓0.122.8 years↓
"Whenever equipped creature deals combat damage to a player, draw two cards. Then discard two cards unless you discard a Pirate card."
Neurok Commando76%
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"Whenever this creature deals combat damage to a player, you may draw a card."
Stealer of Secrets76%
$0.05↓#20654↓0.24↑13.9 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Scroll Thief76%
$0.06↓#17095↓0.36↑16.1 years↓
"Whenever this creature deals combat damage to a player, draw a card."