Robe of the Archmagi 

Artifact — Equipment
$0.42 #5087 0.27 4.4 years
Whenever equipped creature deals combat damage to a player, you draw that many cards.
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Equip Shaman, Warlock, or Wizard 
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Cards similar to Robe of the Archmagi 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.
Starwinder82%
$0.96↑#2348↑0.38↑1.2 years↓
"Whenever a creature you control deals combat damage to a player, you may draw that many cards."
Rogue's Gloves79%
$0.31↓#41620.06↓12.3 years↑
"Whenever equipped creature deals combat damage to a player, you may draw a card."
+1 more matching line
Professor Hulk78%
$0.51↑#9920↓0.41↑0.3 years↓
"Whenever this card deals combat damage to a player, draw that many cards."
Mystery Key77%
$0.12↓#17418↓0.00↓4.4 years
"When equipped creature deals combat damage to a player, sacrifice this Equipment. If you do, draw three cards."
+1 more matching line
Fear of Failed Tests76%
$0.25↓#12451↓0.242.1 years↓
"Whenever this creature deals combat damage to a player, draw that many cards."
Glint-Eye Nephilim76%
$0.21↓#17176↓0.15↓20.7 years↑
"Whenever this creature deals combat damage to a player, draw that many cards."
Mask of Riddles75%
$0.52↑#7547↓0.2717.5 years↑
"Whenever equipped creature deals combat damage to a player, you may draw a card."
+1 more matching line
Cold-Eyed Selkie74%
$0.24↓#2135↑0.3518.2 years↑
"Whenever this creature deals combat damage to a player, you may draw that many cards."
Goggles of Night74%
$0.12↓#11820↓0.06↓4.4 years
"Whenever equipped creature deals combat damage to a player, scry 1, then draw a card."
+1 more matching line
Sergeant John Benton72%
$1.19↑#8641↓0.05↓3.0 years↓
"Whenever this card deals combat damage to a player, you and that player each draw that many cards."
Diviner Spirit72%
$0.21↓#22901↓0.12↓13.0 years↑
"Whenever this creature deals combat damage to a player, you and that player each draw that many cards."
Coastal Piracy72%
$0.29↓#1517↑0.1927.0 years↑
"Whenever a creature you control deals combat damage to an opponent, you may draw a card."
Acquisition Octopus72%
$0.15↓#11028↓0.00↓4.7 years
"Whenever this creature or equipped creature deals combat damage to a player, draw a card."