You can also target another player, whether or not they have that card in their library
There are a few things I would change if I were building this deck myself
Printing cards like Seasoned Pyromancer, Wrenn and Six, Ragavan, Nimble Pilferer, and the like in the way it does currently (at mythic, in sets that aren't limited in supply but have an abnormally high price point of double or more a typical Standard-legal set) all but guarantees they will be incredibly expensive, increasing Wizards ' reprint equity
Many exile effects are instant-speed, like a Relic of Progenitus activation, so they can be used as combat tricks
All these years later and I think the double faced cards were one of the best additions to Magic design space that has occurred since the creation of equipment