Merfolk Spy 
Creature — Merfolk Rogue
$0.16 #19148 0.27 16.3 years
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever this creature deals combat damage to a player, that player reveals a card at random from their hand.
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Cards similar to Merfolk Spy 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-Ti Fang-Blade85%
$0.17↑#13725↑0.13↓5.2 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Shortcut Seeker85%
$0.19↑#161370.04↓5.2 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Precinct Captain80%
$0.25↑#11463↑0.2214.0 years↓
"Whenever this creature deals combat damage to a player, create a 1/1 white Soldier creature token."
Shriekgeist79%
$0.10↓#23923↓0.00↓14.7 years↓
"Whenever this creature deals combat damage to a player, that player mills two cards."
Lavacore Elemental79%
$0.19↑#27645↓0.00↓19.7 years↑
"Whenever a creature you control deals combat damage to a player, put a time counter on this creature."
Lightning Reaver76%
$0.57↑#207580.2817.5 years↑
"Whenever this creature deals combat damage to a player, put a charge counter on it."
Lurking Crocodile76%
$0.12↓#25738↓0.00↓15.3 years
"Islandwalk"
Maelstrom Archangel76%
$0.78↑#6571↑0.2417.7 years↑
"Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost."
Necromaster Dragon74%
$0.29↑#193900.2411.6 years↓
"Whenever this creature deals combat damage to a player, you may pay 
. If you do, create a 2/2 black Zombie creature token and each opponent mills two cards."
. If you do, create a 2/2 black Zombie creature token and each opponent mills two cards."
Inkwell Leviathan74%
$0.40↑#5052↑0.13↓17.7 years↑
"Islandwalk"
Blind Zealot73%
$0.15↓#214720.1915.4 years
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, destroy target creature that player controls."
Mindscour Dragon72%
$0.16#23379↓0.2911.7 years↓
"Whenever this creature deals combat damage to an opponent, target player mills four cards."
Caustic Wasps72%
$0.95↑#15209↑0.47↑27.0 years↑
"Whenever this creature deals combat damage to a player, you may destroy target artifact that player controls."
Academy Raider72%
$0.07↓#209320.00↓13.3 years↓
"Whenever this creature deals combat damage to a player, you may discard a card. If you do, draw a card."
Thrummingbird71%
$0.25↑#829↑0.3016.1 years
"Whenever this creature deals combat damage to a player, proliferate."
Graceful Antelope71%
$0.19↑#28091↓0.06↓25.1 years↑
"Plainswalk"
Empyreal Voyager70%
$0.08↓#188500.41↑10.1 years↓
"Whenever this creature deals combat damage to a player, you get that many 
."
."
Ghostly Keybearer70%
$0.19↑#14036↑0.00↓2.1 years↓
"Whenever this creature deals combat damage to a player, unlock a locked door of up to one target Room you control."
Bayou Dragonfly70%
$0.17↑#23384↓0.06↓29.0 years↑
"Flying; swampwalk"