Coral Fighters 
Creature — Merfolk Soldier
$0.14 #27638 0.06 29.9 years
Whenever this creature attacks and isn't blocked, look at the top card of defending player's library. You may put that card on the bottom of that player's library.
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Cards similar to Coral Fighters 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.
Murk Dwellers78%
$0.06↓#315120.20↑32.1 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Abyssal Nightstalker76%
$0.49↑#275910.27↑28.2 years↓
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Crypt Cobra75%
$0.16↑#284560.75↑29.9 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Precognition75%
$0.38↑#251230.0928.9 years↓
"At the beginning of your upkeep, you may look at the top card of target opponent's library. If you do, you may put that card on the bottom of that player's library."
Suq'Ata Assassin74%
$0.54↑#222140.32↑29.6 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Swamp Mosquito74%
$0.14#19244↑0.0730.2 years
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Keeper of Tresserhorn73%
$0.64↑#314580.25↑30.2 years
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Guiltfeeder72%
$1.43↑#6805↑0.50↑24.3 years↓
"Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard."
Mindstab Thrull72%
$0.14#269250.27↑31.8 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Wu Spy72%
$23.11↑#296540.1327.3 years↓
"When this creature enters, look at the top two cards of target player's library. Put one of them into their graveyard."
Elusive Tormentor // Insidious Mist70%
$0.21↑#20732↑0.0710.4 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Ophidian70%
$0.12↓#265310.25↑29.2 years
"Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn."
Stromgald Spy70%
$0.14#300240.69↑30.2 years
"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."