Library Larcenist {2}{U}
Creature — Merfolk Rogue
Whenever this creature attacks, draw a card.
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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.
Werewolf Pack Leader 95%
$0.39#8342
"Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, draw a card."
Angelic Sell-Sword 91%
$0.44#8244
"Whenever this creature attacks, if its power is 6 or greater, draw a card."
Eternal of Harsh Truths 90%
$0.22#17420
"Whenever this creature attacks and isn't blocked, draw a card."
Gaea's Courser 88%
$0.04#24471
"Whenever this creature attacks, if there are three or more creature cards in your graveyard, draw a card."
Ophidian 86%
$0.43#26493
"Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn."
Jon Irenicus, Shattered One 86%
$0.33#7523
"Whenever a creature you own but don't control attacks, you draw a card."
Balamb Garden, SeeD Academy // Balamb Garden, Airborne 84%
$0.32#6552
"Whenever this card attacks, draw a card."
Iron Man, Modern Marvel 83%
$43.14#19470
"Whenever this card attacks, if you control another artifact creature, draw a card."
Historian of Zhalfir 82%
$0.07#30706
"Whenever this creature attacks, if you control a Teferi planeswalker, draw a card."
Isperia, Supreme Judge 82%
$0.31#9985
"Whenever a creature attacks you or a planeswalker you control, you may draw a card."
Aetherblade Agent // Gitaxian Mindstinger 80%
$0.16#19710
"Whenever this creature deals combat damage to a player or battle, draw a card."