The wildcard slot for Set Boosters can have practically any non-foil card in Innistrad: Crimson Vow
A mana base can be simple (say, seventeen Plains in an all-white, 40-card deck) or it can be quite complex: featuring multiple colors of mana, lands with unusual abilities, and indirect methods of making mana (via artifacts, creatures, or spells)
It'll eventually be followed by Pokemon Trading Card Game Classic (which does exactly what it says on the tin, seeing the return of old-school Pokemon cards) toward the end of 2023
Still, its always an exciting event when a new deck breaks into the upper echelons of the standard format, especially decks as fun and creative as this one
Her Phyrexian horrors get bigger and bigger the longer she goes unchecked, and you often have to expend so many resources getting rid of her that it costs you the game