Opposition Agent 
Creature — Human Rogue
$20.22 #568 2.32 5.8 years
Flash
You control your opponents while they're searching their libraries.
While an opponent is searching their library, they exile each card they find. You may play those cards for as long as they remain exiled, and you may spend mana as though it were mana of any color to cast them.
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Cards similar to Opposition Agent 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.
Praetor's Grasp73%
$10.78↓#1670↓1.02↓15.3 years↑
"Search target opponent's library for a card and exile it face down. Then that player shuffles. You may play that card for as long as it remains exiled."
Mindlock Orb72%
$0.53↓#18780↓0.92↓17.9 years↑
"Players can't search libraries."
Shadow of Doubt70%
$2.72↓#19119↓0.62↓20.9 years↑
"Players can't search libraries this turn."
Stranglehold70%
$7.35↓#6605↓0.70↓15.2 years↑
"Your opponents can't search libraries."
Transcendent Dragon70%
$0.28↓#7186↓0.30↓1.4 years↓
"Flash"