The main line that she specifically enables is the Firemind's Foresight into a one mana draw spell (like Brainstorm or Whispers of the Muse)/Lightning Bolt, Reset/Reality Spasm/Dramatic Reversal and Reiterate
It stands to reason then that a commander that can do both, and for a low cost of 3 mana, is likewise going to be quite good in many decks, and his color identity allows him to fit into a variety of strategies
The Manga Rare Rayleigh has maintained its $600+ valuation, and SP cards continue trading at healthy premiums
But the card's sentimental value is enormous, and PSA 10 copies, which are surprisingly uncommon given that most copies were immediately ripped open and handled with sticky fingers by excited children in movie theater lobbies, command a nostalgic premium that has been climbing steadily year over year
Okay, so the lands are more useful, but what about the spells