Everything is up to you
Draconic Destruction Sure, it used to be much, much cheaper, but Draconic Destruction is a great precon if youre into casting dragons and sending them at opponents
Getting cards graded is a whole separate, much more involved hobby than simply collecting cards, and the people that do it are engaged with the secondary market
has printed several core sets, each with its own theme and card pool that has shaped the meta over the past two years
Trainer gallery cards exploded in popularity, with the Sword & Shield era of sets adding more TG cards per set
When you discover X, you reveal cards one at a time from the top of your library, so any cards that do not meet your discover value of X become the rest and essentially get shuffled before you place them at the bottom of your library