Talion , Reckless Gunslinger

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