Q&A:
Q: Are the numbers of pillars, creatures, spells and permanents fixed numbers or they'll be something like (12< pillars, 6>permanents, etc...)?
Q: Will all decks be the same amount of cards in them?
A: Could be anything.
Q: Do we choose our class prior to knowing how many creatures, pillars, etc. are in each class or after?
A: Numbers will be revealed after all players choose a class.