A Spellbook is no longer required: to join a guild, win Glint in ranked matches, buy Credits, buy cards, receive gifts of packs or cards, receive card delegations, take part in Brawls and earn Merits, rent cards seasonally, combine cards, open packs or buy Rewards in the store with Glint

A Spellbook is still required to: sell cards, transfer cards, delegate cards, list cards for rent, hold Dark Energy Crystals (DEC) or Splintershards (SPS), enter a tournament, create or own a guild, earn Jackpot rewards, access lands, access Soulkeep and earn SPS rewards.

That was the best news of the day, I hope they now add starter packs, like a start pack for each element