005-013 could find a home in a Steelsong deck, as they will be playing a lot of songs anyway
Ursulas Shell Necklace
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That's a very powerful ramp effect, usually seen on green cards like Dryad of the Ilysian Grove
You'll want to keep him as safe as possible with Bodyguards, Locations, and characters that grant him Ward or Evasive because if your opponent can't get rid of him quickly, you can run away with the game.
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