The Oneiromancer
Identity — Traitor (U)
Unveil {X}{X} (Start the game with this identity face down in the command zone. Turn it face up any time for its unveil cost.)
When The Oneiromancer is unveiled, exile the top X cards of each player’s library face down.
You may look at cards exiled with The Oneiromancer.
Once each turn, you may cast a spell among cards exiled with The Oneiromancer without paying its mana cost. When you do, exile the top card of target player’s library face down.