Tax Collector 

Creature — Human Advisor
$0.32 #8601 0.60 2.3 years
When this creature enters, choose one —
• Tax — Until your next turn, spells your opponents cast cost
more to cast.
• Arrest — Detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)
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Cards similar to Tax Collector 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.
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"

: Detain target nonland permanent an opponent controls."