Wu Spy 

Creature — Human Soldier Rogue
$23.11 #29654 0.13 27.3 years
When this creature enters, look at the top two cards of target player's library. Put one of them into their graveyard.
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Cards similar to Wu 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.
Draugr Thought-Thief98%
$0.10↓#240600.37↑5.6 years↓
"When this creature enters, look at the top card of target player's library. You may put that card into their graveyard."
Eye Spy94%
$0.22↓#273440.38↑28.2 years
"Look at the top card of target player's library. You may put that card into their graveyard."
Cruel Fate90%
$0.75↓#304770.77↑29.3 years↑
"Look at the top five cards of target opponent's library. Put one of those cards into that player's graveyard and the rest on top of their library in any order."
Lurking Informant89%
$0.21↓#267880.0520.9 years↓
"
,
: Look at the top card of target player's library. You may put that card into that player's graveyard."
Dimir Charm88%
$0.27↓#9973↑0.57↑13.7 years↓
"• Look at the top three cards of target player's library. Put one back and the rest into that player's graveyard."
Precognition82%
$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."
Ransack75%
$0.17↓#290530.50↑28.5 years↑
"Look at the top five cards of target player's library. Put any number of them on the bottom of that library in any order and the rest on top of the library in any order."
Sealed Fate75%
$0.19↓#294130.0529.9 years↑
"Look at the top X cards of target opponent's library. Exile one of those cards and put the rest back on top of that player's library in any order."
Sage of Days74%
$0.07↓#248010.00↓2.8 years↓
"When this creature enters, look at the top three cards of your library. You may put one of those cards back on top of your library. Put the rest into your graveyard."
Merfolk Observer72%
$0.17↓#299200.79↑16.4 years↓
"When this creature enters, look at the top card of target player's library."