Swordsman, Sharp Scoundrel 

Legendary Creature — Human Hero Villain
Whenever another Villain you control enters, attach up to one target Equipment you control to target creature you control.
Whenever an equipped creature you control attacks, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)
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Cards that do something similar 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.
Mage Slayer 84%
$1.57#4244
"Whenever equipped creature attacks, it deals damage equal to its power to the player or planeswalker it's attacking."
Mask of the Schemer 81%
$0.53#11496
"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
Battlegrace Angel 81%
$1.22#12401
"Whenever a creature you control attacks alone, it gains lifelink until end of turn."
Lothlórien Blade 81%
$0.31#9380
"Whenever equipped creature attacks, it deals damage equal to its power to target creature defending player controls."