Harbor Guardian {2}{W}{U}
Creature — Gargoyle
Reach (This creature can block creatures with flying.)
Whenever this creature attacks, defending player may 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 88%
$0.39#8342
"Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, draw a card."
Xantid Swarm 88%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Eternal of Harsh Truths 87%
$0.22#17420
"Whenever this creature attacks and isn't blocked, draw a card."
Gaea's Courser 87%
$0.04#24471
"Whenever this creature attacks, if there are three or more creature cards in your graveyard, draw a card."
Ophidian 87%
$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."
Goblin Guide 86%
$1.25#14644
"Whenever this creature attacks, defending player reveals the top card of their library. If it's a land card, that player puts it into their hand."
Conundrum Sphinx 85%
$0.32#17473
"Whenever this creature attacks, each player chooses a card name. Then each player reveals the top card of their library. If the card a player revealed has the name they chose, that player puts it into their hand. If it doesn't, that player puts it on the bottom of their library."
Norn's Decree 84%
$8.55#4047
"Whenever a player attacks, if one or more players being attacked are poisoned, the attacking player draws a card."
Angelic Sell-Sword 84%
$0.44#8244
"Whenever this creature attacks, if its power is 6 or greater, draw a card."
Mtenda Lion 84%
$0.17#31500
"Whenever this creature attacks, defending player may pay {U}. If that player does, prevent all combat damage that would be dealt by this creature this turn."
Innocuous Researcher 83%
$0.26#12932
"Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you investigate. Then each player draws a card."
Ogre Marauder 83%
$0.25#24804
"Whenever this creature attacks, it gains "this creature can't be blocked" until end of turn unless defending player sacrifices a creature of their choice."
Shadowmage Infiltrator 83%
$0.40#5436
"Whenever this creature deals combat damage to a player, you may draw a card."
Ninja of the Deep Hours 83%
$2.04#3480
"Whenever this creature deals combat damage to a player, you may draw a card."
Neurok Commando 83%
$0.05#18562
"Whenever this creature deals combat damage to a player, you may draw a card."
Broodbirth Viper 83%
$0.57#12828
"Whenever this creature deals combat damage to a player, you may draw a card."