Bridget, Yoyo-Slinger

When Bridget enters the battlefield you may
pay {x} life, and if you do, mill {x} cards then
draw {x} + 1 cards. You may cast instants and sorceries from among those milled cards until your next upkeep.

{2}{u}{t}: Choose 1 instant or sorcery from among those in your graveyard and exile piles: cast it without paying its mana cost, then add it to target opponent's hand.