Siphon Insight 
Instant
$0.23 #4324 0.37 4.9 years
Look at the top two cards of target opponent's library. Exile one of them face down and put the other on the bottom of that library. You may play the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.
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Cards similar to Siphon Insight 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.
Outrageous Robbery96%
$0.38↑#47110.402.6 years↓
"Target opponent exiles the top X cards of their library face down. You may look at and play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any type to cast it."
Gonti, Lord of Luxury91%
$0.28↑#2046↑0.55↑9.9 years↑
"When this card enters, look at the top four cards of target opponent's library, exile one of them face down, then put the rest on the bottom of that library in a random order. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell."
Decadent Dragon // Expensive Taste90%
$0.95↑#3260↑0.19↓3.0 years↓
"Exile the top two cards of target opponent's library face down. You may look at and play those cards for as long as they remain exiled."
Korvold and the Noble Thief90%
$0.27↑#11922↓0.53↑3.0 years↓
"Exile the top three cards of target opponent's library. You may play those cards this turn."
Black Cat, Cunning Thief90%
$0.58↑#6868↓0.64↑1.0 years↓
"When this card enters, look at the top nine cards of target opponent's library, exile two of them face down, then put the rest on the bottom of their library in a random order. You may play the exiled cards for as long as they remain exiled. Mana of any type can be spent to cast spells this way."
You Find Some Prisoners90%
$0.18↓#44340.21↓5.1 years
"• Interrogate Them — Exile the top three cards of target opponent's library. Choose one of them. Until the end of your next turn, you may play that card, and you may spend mana as though it were mana of any color to cast it."
Villainous Wealth88%
$0.29↑#2406↑0.63↑11.9 years↑
"Target opponent exiles the top X cards of their library. You may cast any number of spells with mana value X or less from among them without paying their mana costs."
Petty Larceny86%
$0.28↑#10426↓0.282.2 years↓
"Look at the top two cards of target opponent's library and exile those cards face down. You may play those cards for as long as they remain exiled, and mana of any type can be spent to cast them. Create a Treasure token."
Inside Information86%
$2.87↑#14825↓0.00↓0.1 years↓
"Exile the top X cards of target opponent's library. You may play those cards this turn. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost."
Stolen Goods86%
$0.25↑#9128↓0.92↑14.3 years↑
"Target opponent exiles cards from the top of their library until they exile a nonland card. Until end of turn, you may cast that card without paying its mana cost."
Evelyn, the Covetous86%
$0.29↑#14617↓0.53↑4.4 years
"Flash"
Knacksaw Clique86%
$3.35↑#17338↓0.20↓18.3 years↑
", 
: Target opponent exiles the top card of their library. Until end of turn, you may play that card."
, : Target opponent exiles the top card of their library. Until end of turn, you may play that card."
Stolen Strategy85%
$0.34↑#45630.65↑8.2 years↑
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Mindleecher84%
$0.42↑#10096↓0.446.4 years↑
"Whenever this creature mutates, exile the top card of each opponent's library face down. You may look at and play those cards for as long as they remain exiled."
Ornate Kanzashi84%
$0.34↑#26616↓0.05↓21.6 years↑
"
, 
: Target opponent exiles the top card of their library. You may play that card this turn."
, : Target opponent exiles the top card of their library. You may play that card this turn."
Bloodsoaked Insight // Sanguine Morass84%
$0.30↑#2687↑0.17↓2.2 years↓
"Target opponent exiles the top three cards of their library. Until the end of your next turn, you may play those cards. If you cast a spell this way, mana of any type can be spent to cast it."
Blightwing Bandit84%
$4.31↑#6132↓0.59↑3.0 years↓
"Whenever you cast your first spell during each opponent's turn, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it."
Lidless Gaze83%
$0.29↑#11879↓0.06↓3.2 years↓
"Exile the top card of each player's library. Until the end of your next turn, you may play those cards, and mana of any type can be spent to cast those spells."
Court of Locthwain82%
$5.56↑#3344↑0.403.0 years↓
"At the beginning of your upkeep, exile the top card of target opponent's library. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it. If you're the monarch, until end of turn, you may cast a spell from among cards exiled with this enchantment without paying its mana cost."
Cunning Rhetoric82%
$2.19↑#2624↑0.365.4 years
"Whenever an opponent attacks you and/or one or more planeswalkers you control, exile the top card of that player's library. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast it."