I would go for commons and maybe even some rares that you don't think you'll be using. You can target getting them back because of the "choose from three" mechanic.
Well, if I'm getting full value, I can just ditch the rares, too, because the instant I want them back, I can just re-buy them and have lost nothing.
Right now, I have like 75 ore, 20 kegs, and about 7000 scraps. So with lots of milling, I'm hoping I can get to about 10,000 scraps with at least a competent Monsters deck to begin some grinding before testing other builds.
Do not craft the Wild Hunt deck. It loses hard to Mulligan; the deck runs all 3 clears and out tempos WH even with Longship. In fact there has been very little that has troubled me so far on the ladder apart from Nilfgaard which is a wonky match up I can't call because there are so many variations floating about. Dagon point value loses and nerfs hurt and consume is beyond awful. Honestly I don't see monsters having much of a place in the meta. You either have to run insane tempo or hard control, so a variant on your Eredin control might work?
Francesca with Saskia is broken but makes for a pretty fun deck. I often have 6 units on the board first turn playing only
ONE card (mulligan two Wardancers, play Blue Mountain Commando, pulls Aelirenn) which is then followed up by massive bronze units, lots of buffing and the choice of any cards from my deck. Iorverth may only be 14 points but he checks a lot of stuff, Saesenthessis is a beast that a lot of people don't see coming (it's not hard for it to be 25 points) plus Morenn means I have a surprisingly decent removal suite. Add Horn and Toruviel and it's a points fiesta. Elves are amazing.