Prepare
(
as a sorcery: Exile this face down from your hand. On future turns you may cast it from exile for its prepare cost as if it had flash.)
Target player can't cast spells or activate abilities this turn.
(Spells and abilities played before this resolves are unaffected.)"Where is he? Where is Zero?!"
A variation on Orim's Chant/Silence. I could optionally add a clause like Orim's Chant's "can't attack" as well. The moment in the series this represents are kinda mid-combat, so "can't attack" isn't required for the flavour, but it could be added if we want it.
My intent is that it'll mainly serve as a pre-emptive anti-combat-tricks ward. Or at least "play all your combat tricks now, cause you can't do them later this turn."