Riddles in the Dark 
Instant
$0.39 #15617 0.00 0.1 years
Look at the top four cards of your library and separate them into a face-down pile and a face-up pile. An opponent chooses one of the piles. Put that pile into your hand and the other into your graveyard.
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Cards similar to Riddles in the Dark 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.
Fortune's Favor94%
$0.21↓#148630.11↑10.1 years↑
"Target opponent looks at the top four cards of your library and separates them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard."
Steam Augury93%
$0.20↓#139000.35↑12.9 years↑
"Reveal the top five cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard."
Epiphany at the Drownyard92%
$0.31↓#12240↑0.50↑10.4 years↑
"Reveal the top X plus one cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard."
Curator of Destinies92%
$0.18↓#11383↑0.23↑1.8 years↑
"When this creature enters, look at the top five cards of your library and separate them into a face-down pile and a face-up pile. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard."
Hostile Negotiations90%
$0.32↓#6378↑0.24↑3.8 years↑
"Exile the top three cards of your library in a face-down pile, then exile the top three cards of your library in another face-down pile. Look at the cards in each pile, then turn a pile of your choice face up. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard. You lose 3 life."
Truth or Tale88%
$0.23↓#160320.35↑19.9 years↑
"Reveal the top five cards of your library and separate them into two piles. An opponent chooses one of those piles. Put a card from the chosen pile into your hand, then put all other cards revealed this way on the bottom of your library in any order."
Sphinx of Uthuun88%
$0.13↓#10105↑0.65↑15.1 years↑
"When this creature enters, reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard."
Atris, Oracle of Half-Truths88%
$0.18↓#12295↑0.44↑6.6 years↑
"When this card enters, target opponent looks at the top three cards of your library and separates them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard."
Fact or Fiction88%
$0.19↓#703↑0.26↑25.9 years↑
"Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard."
Sauron's Ransom86%
$0.52↑#4984↑0.36↑3.2 years↑
"Choose an opponent. They look at the top four cards of your library and separate them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard. The Ring tempts you."
Intrude on the Mind85%
$0.29↓#135080.12↑2.6 years↑
"Reveal the top five cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard. Create a 0/0 colorless Thopter artifact creature token with flying, then put a +1/+1 counter on it for each card put into your graveyard this way."
Murmurs from Beyond82%
$0.11↓#21813↓0.25↑21.3 years↑
"Reveal the top three cards of your library. An opponent chooses one of them. Put that card into your graveyard and the rest into your hand."
Covenant of Minds80%
$0.18↓#20485↓0.19↑17.9 years↑
"Reveal the top three cards of your library. Target opponent may choose to put those cards into your hand. If they don't, put those cards into your graveyard and draw five cards."
Abstract Performance80%
$0.21↓#11729↑0.000.4 years
"Exile the top four cards of your library in a face-down pile, then exile the top four cards of your library in a face-up pile. An opponent chooses one of those piles. Put that pile into your graveyard. Look at the cards in the other pile. You may cast a spell from among them without paying its mana cost. Put the rest into your hand."
Glimpse the Future78%
$0.08↓#26443↓0.0613.1 years↑
"Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard."
Strategic Planning78%
$0.14↓#7787↑0.25↑27.3 years↑
"Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard."
Ransack the Lab78%
$0.16↓#11707↑0.25↑7.2 years↑
"Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard."
Scattered Thoughts78%
$0.18↓#166130.27↑4.8 years↑
"Look at the top four cards of your library. Put two of those cards into your hand and the rest into your graveyard."
Moment of Truth78%
$0.24↓#127660.15↑3.4 years↑
"Look at the top three cards of your library. Put one of those cards into your hand, one into your graveyard, and one on the bottom of your library."
Sphinx of Clear Skies78%
$0.29↓#150630.054.0 years↑
"Whenever this creature deals combat damage to a player, reveal the top X cards of your library, where X is the number of basic land types among lands you control. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard."