Merfolk Spy 
Creature — Merfolk Rogue
$0.23 #18822 0.05 16.1 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↓#13493↑0.27↑5.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Shortcut Seeker85%
$0.20↓#157760.17↑5.1 years↓
"Whenever this creature deals combat damage to a player, venture into the dungeon."
Precinct Captain80%
$0.24↑#11137↑0.25↑13.9 years↓
"Whenever this creature deals combat damage to a player, create a 1/1 white Soldier creature token."
Shriekgeist79%
$0.13↓#23593↓0.0014.6 years↓
"Whenever this creature deals combat damage to a player, that player mills two cards."
Lavacore Elemental79%
$0.14↓#27309↓0.29↑19.6 years↑
"Whenever a creature you control deals combat damage to a player, put a time counter on this creature."
Vorosh, the Hunter77%
$0.73↑#195880.41↑19.6 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
. If you do, put six +1/+1 counters on this card."
Lightning Reaver76%
$0.58↑#203420.71↑17.3 years↑
"Whenever this creature deals combat damage to a player, put a charge counter on it."
Maelstrom Archangel76%
$0.89↑#6522↑0.42↑17.6 years↑
"Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost."
Lurking Crocodile76%
$0.12↓#25384↓0.0615.1 years
"Islandwalk"
Necromaster Dragon74%
$0.31↑#189070.19↑11.4 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."
Blind Zealot73%
$0.16↓#212440.29↑15.3 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%
$0.14↓#22950↓0.0011.6 years↓
"Whenever this creature deals combat damage to an opponent, target player mills four cards."
Caustic Wasps72%
$0.92↑#14822↑0.47↑26.9 years↑
"Whenever this creature deals combat damage to a player, you may destroy target artifact that player controls."
Academy Raider72%
$0.11↓#207520.0013.1 years↓
"Whenever this creature deals combat damage to a player, you may discard a card. If you do, draw a card."
Abomination of Gudul71%
$0.05↓#27440↓0.38↑11.9 years↓
"Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card."
Graceful Antelope71%
$0.19↓#27743↓0.0724.9 years↑
"Plainswalk"
Empyreal Voyager70%
$0.09↓#186700.129.9 years↓
"Whenever this creature deals combat damage to a player, you get that many 
."
."
Ghostly Keybearer70%
$0.19↓#13134↑0.081.9 years↓
"Whenever this creature deals combat damage to a player, unlock a locked door of up to one target Room you control."
Enclave Elite70%
$0.08↓#23616↓0.36↑16.6 years
"Islandwalk"