If I were you I would hold, see if you pull someone more interesting.
Glenda is quite underwhelming, damage is meh and the buff to special attack is barely noticeable except on AoE. The cleanse is good but you have Ariel.
Isarnia is great with her skyrocket attack but you already have Athena for titans, and she’s squishy af.
Alasie is a great hero and you could her instead of magni, but she needs emblems to be efficient enough now.
Fenrir hits like a wet noodle, misandra is even worse, both are not worse spending mats on at all when you already have a bench. Frosth is only if you want to build and offense minion team.
Raffa is good healer, if you need a second one after Ariel. When I do i usually use cKiril though