Skeleton Key 
Artifact — Equipment
$0.26 #8744 0.35 10.4 years
Equipped creature has skulk. (It can't be blocked by creatures with greater power.)
Whenever equipped creature deals combat damage to a player, you may draw a card. If you do, discard a card.
Equip 
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Cards similar to Skeleton Key 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 Boots90%
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"Whenever equipped creature deals combat damage to a player, draw a card, then discard a card."
+2 more matching lines
Abomination of Gudul84%
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"Whenever this card deals combat damage to a player, draw a card, then discard a card."
Mask of Memory82%
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"Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card."
+1 more matching line
Behind the Scenes81%
$0.27↑#4926↑0.3210.4 years
"Creatures you control have skulk."
Daring Saboteur80%
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"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
Jeskai Elder80%
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"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
Pip-Boy 300080%
$6.92↑#2671↑0.22↓2.5 years↓
"Equip "
"
Assassin Gauntlet79%
$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
Mask of the Schemer76%
$1.48↑#11411↓0.324.4 years↓
"Whenever equipped creature deals combat damage to a player, it connives X, where X is the amount of damage it dealt to that player."
+1 more matching line
Tomebound Lich75%
$0.29↑#13468↓0.05↓7.2 years↓
"Whenever this creature enters or deals combat damage to a player, draw a card, then discard a card."
Looter il-Kor74%
$0.15↓#5399↑0.16↓19.9 years↑
"Whenever this creature deals damage to an opponent, draw a card, then discard a card."
Wharf Infiltrator72%
$0.34↑#6505↑0.24↓10.1 years
"Whenever this 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 Weird72%
$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."
Bilbo, Luckwearer // Burglar's Plot72%
$0.23↓#14259↓0.00↓0.1 years↓
"Whenever this card deals combat damage to a player, draw a card, then discard a card."
Izzet Keyrune72%
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"Whenever this artifact deals combat damage to a player, you may draw a card. If you do, discard a card."
Trickster's Talisman72%
$0.24↓#16936↓0.335.1 years↓
"Equip "
"
Surge Mare71%
$0.18↓#19470↓0.00↓8.1 years↓
"Whenever this creature deals damage to an opponent, you may draw a card. If you do, discard a card."
Thieves' Tools71%
$0.22↓#5964↑0.00↓5.1 years↓
"Equip "
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Jace, Cunning Castaway70%
$1.10↑#13211↓0.61↑8.9 years↓
"+1: Whenever one or more creatures you control deal combat damage to a player this turn, draw a card, then discard a card."