Primarily, it amplifies the collector's journey, creating fresh "chase" cards that can reinvigorate interest and provide new goals
Which, in turn, is often the key to winning, so a ton of decks include card drawing not because of any specific payoff for playing something that says draw, but because drawing cards is one of the most powerful things to do in Magic
To fill up your graveyard, Celes, Rune Knight and Mog, Moogle Warrior arrive with potent effects that get creatures into your graveyard, with the Celes also being her own wincon and value engine with her ability to grow your whole board every time a creature enters from your graveyard
Towns This expansion introduces a new land type, with a good number of Towns matter cards in the set to help build a theme deck
Yes, they are mechanically identical to the non-serialized version and fully tournament legal