The new mechanics and refreshed concepts in the expansion add depth to the game, making it more interesting for experienced players
The new Ral adds a fun wrinkle when he flips into his planeswalker form and lets you play a bunch of spells for free, but the deck's win condition is a Storm staple Grapeshot, or else the new Unstable Amulet which can slowly ping a player to death
Something really unique for an incredibly fan favourite character, that tells her story so well
The new tokens don't copy whether the original token is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, color, and so on
Any abilities that trigger won't be put onto the stack until Mystic Confluence is done resolving
I'm a big fan of drafting lands, and showcasing towns was a crucial part of depicting the worlds of the FINAL FANTASY franchise