Mask of Memory 
Artifact — Equipment
$0.33 #980 0.14 23.0 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%
$0.36↑#4552↓0.03↓5.5 years↓
"Whenever equipped creature deals combat damage to a player, draw a card, then discard a card."
+1 more matching line
Rogue's Gloves85%
$0.31↓#4162↓0.0612.3 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
+1 more matching line
Tomebound Lich85%
$0.34↑#13696↓0.057.3 years↓
"Whenever this creature enters or deals combat damage to a player, draw a card, then discard a card."
Skeleton Key82%
$0.27↓#8585↓0.1410.5 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%
$0.19↓#18529↓0.41↑0.6 years↓
"Whenever this card deals combat damage to a player, draw that many cards, then discard a card."
Locke Cole80%
$0.22↓#11022↓0.091.4 years↓
"Whenever this card deals combat damage to a player, draw a card, then discard a card."
Mask of Riddles78%
$0.52↑#7547↓0.27↑17.5 years↓
"Whenever equipped creature deals combat damage to a player, you may draw a card."
+1 more matching line
Daring Saboteur78%
$0.08↓#11245↓0.069.1 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%
$0.24↓#16731↓0.125.1 years↓
"Whenever this creature deals combat damage to a player, draw a card, then discard a card."
Assassin Gauntlet77%
$0.31↓#5613↓0.242.3 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%
$0.04↓#18894↓0.1112.1 years↓
"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
Coastal Piracy77%
$0.29↓#1517↓0.1927.0 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Acquisition Octopus76%
$0.15↓#11028↓0.00↓4.7 years↓
"Whenever this creature or equipped creature deals combat damage to a player, draw a card."
Arm-Mounted Anchor76%
$0.21↓#12524↓0.00↓2.9 years↓
"Whenever equipped creature deals combat damage to a player, draw two cards. Then discard two cards unless you discard a Pirate card."
Stealer of Secrets76%
$0.05↓#21082↓0.29↑14.0 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Scroll Thief76%
$0.06↓#17346↓0.00↓16.3 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Nine-Tail White Fox76%
$0.22↓#22246↓0.108.3 years↓
"Whenever this creature deals combat damage to a player, draw a card."
Moon-Circuit Hacker76%
$0.20↓#3677↓0.104.7 years↓
"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card unless this creature entered this turn."