Changing the as-fan of rarities (that is, the count of each rarity of card you'd expect to see when you open a booster), introducing more variance in slots, adding in more "outside" cards, all impact how the set plays and thus requires us to change how we build the set
The solution is the Split and Conquer method
The rules for these mechanics haven't changed for this set, although in some cases, the rules for the game have changed since you may have last seen them
Some decks contain cards that are no longer tournament legal, but can still be fun to play casually
Even drawing ten cards in a format that powerful is enough advantage to end the game, but Ad Nauseum decks are generally capable of drawing even more cards before they need to watch their life total
Costing two blue and two colorless mana, this blue sorcery takes advantage of Wilds of Eldraine's new Roles mechanic by letting players enchant their opponent's creatures effectively turning them into 1/1 creatures