Jester's Scepter 
Artifact
$0.39 #25015 0.19 20.1 years
When this artifact enters, exile the top five cards of target player's library face down. You may look at those cards for as long as they remain exiled.
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Cards similar to Jester's Scepter 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.
Mindreaver81%
$0.13↓#31026↓0.1212.6 years↓
"
, Sacrifice this creature: Counter target spell with the same name as a card exiled with this creature."
+1 more matching line
Grimoire Thief73%
$0.64↑#237960.67↑18.6 years↓
"Whenever this creature becomes tapped, exile the top three cards of target opponent's library face down."
+1 more matching line
Knowledge Pool72%
$1.08↑#6759↑1.14↑15.6 years↓
"When this artifact enters, each player exiles the top three cards of their library."
Circu, Dimir Lobotomist72%
$0.40↑#18101↑0.2720.9 years
"Whenever you cast a blue spell, exile the top card of target player's library."
+1 more matching line
Gonti, Lord of Luxury72%
$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."
Declaration of Naught72%
$16.00↑#18265↑0.62↑18.6 years↓
"
: Counter target spell with the chosen name."