Dismas, Rogue Highwayman

Creatures you control but don't own are Mercenaries in addition to their other types.
At the beginning of your upkeep, exile the top X cards of target opponent's library, where X is the number of outlaws you control. Until end of turn, you. may cast spells from among those cards, and mana of any type can be spent to cast those spells.

"No way out, hmph. Let's do this."
- Dismas, Rogue Highwayman