Thanks to white, we'll be able to remove creatures with ease, and can deal with enchantments and artifacts as well
He also brings a competitive aspect to the game buffing your in-play Princess characters
The downside is still real in decks that want to be casting more expensive spells later in the game, but its tough to find a more reliable early game land for decks looking to cast spells from across different colors in the first few turns of the game
If this spell was cast from a graveyard, exile it, then put it onto the battlefield transformed under its owner's control with a finality counter on it
Blue has some majorly powerful card draw enablers, too
The action, adventure, and spirit of Avatar: The Last Airbender awaken in Magic: The Gathering