In case anyone needs reminding, Metamorphoses is good for Saltstone teams, but Saltstone is generally a pretty bad element because old Witch never split Mercury/Brimstone/Saltstone and instead split Physical/Magical, and Brimstone just ends up being better at Physical than Saltstone, and Mercury ends up being better at Magic than Saltstone. The only time they ever split M/B/S was for the Chinese New Year boss I think it was, where certain elements got a buff or debuff depending on the boss, but the best strat was to just use Amanami and Shuffle UEs to kill the boss since they had a shit ton of HP and not a lot of Defense

At the end game, Meta was used very seldomly in rankings as a sacrifice doll where you reset the fight until you got her ATK buff or her Def buff, whichever one you were going for and then let her die