Pact Weapon 
Artifact — Equipment
$3.74 #5678 0.75 4.2 years
As long as this Equipment is attached to a creature, you don't lose the game for having 0 or less life.
Whenever equipped creature attacks, draw a card and reveal it. The creature gets +X/+X until end of turn and you lose X life, where X is that card's mana value.
Equip—Discard a card.
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Cards similar to Pact Weapon 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.
Murderer's Axe82%
$0.11↓#24605↓0.31↓10.4 years↑
"Equip—Discard a card."
Bloodthorn Flail76%
$0.28↓#15015↓0.53↓2.8 years↓
"Equip—Pay or discard a card."
or discard a card."
Voltaic Whip74%
$0.21↓#23090↓0.00↓0.2 years↓
"Equipped creature gets +2/+0 and has "Whenever this creature attacks alone, you draw a card and lose 1 life.""
+1 more matching line
Bilbo's Ring74%
$8.89↑#48340.23↓3.2 years↓
"Whenever equipped creature attacks alone, you draw a card and you lose 1 life."
Ruin Raider74%
$0.26↓#17857↓0.00↓8.9 years↑
"At the beginning of your end step, if you attacked this turn, reveal the top card of your library and put that card into your hand. You lose life equal to the card's mana value."
Syr Gwyn, Hero of Ashvale72%
$2.66↓#10909↓0.29↓6.9 years↑
"Whenever an equipped creature you control attacks, you draw a card and you lose 1 life."
Stormbeacon Blade71%
$0.23↓#12389↓0.11↓1.4 years↓
"Whenever equipped creature attacks, draw a card if you control three or more attacking creatures."
+1 more matching line
Coercive Impetus70%
$0.33↓#7325↓0.00↓0.4 years↓
"Whenever enchanted creature attacks, you draw a card and lose 1 life."