Shimmering Skies is bringing toolbox characters, some impressive Song enablers, and a chance to cast a few free cards
On top of that, you can cast a card from your hand for free , as long as the mana value is no more than the damage dealt
I could list every new card I love - like Alice, Growing Girl, who lends the Support keyword to your other characters and gains four lore when you reach ten strength, or Sisu, Divine Water Dragon, who allows you to draw a new card every time you quest - but in general all of the new cards in Rise of the Floodborn feel like a shift in power and ability
Archazia's Island is the seventh Disney Lorcana set so far, but I've still been able to dive back in using the starter decks without getting lost
While you can play around with this if you want, if you're new, you may want to use it as a relatively strict guide