Judge Advokist General

Forecast - {w}{u}: (Activate this ability only during
your upkeep and only once each turn.) Reveal
Judge Advokist General from your hand: 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.)
Flash, Addendum - If you cast this spell during
your main phase, then When Judge Advokist
General enters the battlefield, exile target
permanent an opponent controls until Judge
Advokist