House and Preston will let you customize the deck with non-Fallout cards most freely, in either dice-rolling or enchantress, but otherwise The Master, Transcendent is probably the most splashable in general for Sultai decks
Its tempting to stuff your cart, but being considerate helps maintain a healthy collecting community for everyone
This makes it a sideboard card that can deal with some very specific matchups
Kefka, Ruler of Ruin will net you a lot of cards in the right deck
The 65 included card sleeves (which feature the Mythical Pokmon Mew) will keep your deck in tip-top shape, and items like damage-counter dice and acrylic condition markers let you play in style
Sure, it can be a combo-enabler, but I think folks will run that a few times and then just get bored with it