Opposition Agent


The Tentacled One
So this thing was spoiled recently...

Opposition Agent
Creature — Human Rogue
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.

It's pretty scary and we'll be seeing more of it somewhere. It's just a matter of figuring out which decks do best with this card. The obvious example that's been talked about has been to cast Scheming Symmetry, flash this in, then use Scheming Symmetry to find Maralen of the Mornsong. Untap, cast Maralen, and your opponent never gets another card again unless they can kill one of your creatures. That's an extreme example, but there's some very evident power to be had here.