The combination of Sephiroth's popularity, the premium Surge Foil treatment, and the double-sided mechanic makes it one of the most desirable non-Chocobo cards in the set.
She deals damage to the board when played, and also dishes out another two damage to any opposing character when she banishes a character in a challenge
Even if Cyclonic Rift is the best blue interaction/wrath, there are other options worth considering
Pluto Guard Dog could be used in a similar way to how Lawrence Jealous Manservant and Chien-Po Imperial Soldier have been in Steel
Good Budget Ruby/Emerald Deck This starter deck's greatest strengths are its Evasive characters and its ability to remove threats from the board, so this build emphasizes both of those strategies, while also aiming to make the deck more consistent
So, an Amethyst/Steel card cannot go into an Amethyst/Amber deck