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If you have a lot of relevant permanents such that their Detention Spheres always have targets but yours might rarely have non Detention Sphere targets, you might need Banishing Light so that you can remove their Detention Spheres with a card that would otherwise be dead, having no other target than Detention Sphere
Speaking of which, we can also just run Demonic Tutor and Vampiric Tutor, which can dig out our Swiftfoot Boots or our Relentless Assault
Most of the time, this means during your main phase while the stack is empty
(This is not suitable when you want to display them neatly in a case, as they may go in at an angle in the case of Sai Drawder, etc.) This plastic case is designed to store trading cards carefully
Its the exact kind of creature a control deck needs