There are 30 mythic rares in The Big Score, and you'll be able to find them on The List for Outlaws of Thunder Junction
Instead, the Hatter comes with three lore every time you quest and, its highlight, the power to draw a card whenever its challenged by your opponent
Every card you're not actively using in your deck is part of your sideboard, so if one color combo just isn't working for you, maybe wait until the match is over and try swapping it around
Collector booster contents Collecting Magic: The Gathering Assassin's Creed A Beyond booster is essentially a mainline product for Universes Beyond sets while Collector boosters are an alternative product that can be associated with any set release (the Doctor Who Commander set had Collector boosters, for example)
Cid, Timeless Artificer Cid, Timeless Artificer is an interesting build-around that I imagine comes in two flavors: You either go hard on looting, cycling, and self-mill to throw multiple copies of Cid in the graveyard, or you do some Mirror Box shenanigans
5% of Play Boosters contain an art card stamped with the artist signature or Planeswalker symbol