Stromgald Spy {3}{B}
Creature — Human Rogue
Whenever this creature attacks and isn't blocked, you may have defending player play with their hand revealed for as long as this creature remains on the battlefield. If you do, this creature assigns no combat damage this turn.
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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.
Yuan Shao's Infantry 89%
$5.31#31156
"Whenever this creature attacks alone, this creature can't be blocked this combat."
Abyssal Nightstalker 89%
$0.50#27330
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Bone Dancer 88%
$3.22#22494
"Whenever this creature attacks and isn't blocked, you may put the top creature card of defending player's graveyard onto the battlefield under your control. If you do, this creature assigns no combat damage this turn."
Xantid Swarm 88%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Ogre Marauder 88%
$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."
Shrieking Specter 86%
$1.08#30458
"Whenever this creature attacks, defending player discards a card."
Smirking Spelljacker 86%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Kukemssa Pirates 86%
$2.03#22260
"Whenever this creature attacks and isn't blocked, you may gain control of target artifact defending player controls. If you do, this creature assigns no combat damage this turn."
Ophidian 84%
$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."
Dauthi Mindripper 84%
$0.26#22949
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Mindstab Thrull 84%
#26488
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Gutter Skulker // Gutter Shortcut 83%
$0.08#21571
"This creature can't be blocked as long as it's attacking alone."
Headless Specter 83%
$0.08#27598
"Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards a card at random."
Hardened Berserker 83%
$0.03#23580
"Whenever this creature attacks, the next spell you cast this turn costs {1} less to cast."
Book Devourer 83%
$0.19#23187
"Whenever this creature deals combat damage to a player, you may discard all the cards in your hand. If you do, draw that many cards."
Needle Specter 82%
$1.15#17350
"Whenever this creature deals combat damage to a player, that player discards that many cards."
Dreamstealer 82%
$0.28#16148
"Whenever this creature deals combat damage to a player, that player discards that many cards."