Managed to mincost Rowanna, as much as I should have saved my SCs (3 starred all maps for both missions and burned them all on Rowanna). This was the event that was active when I first started playing, but was too weak to even get a base unit, so I felt compelled to try. Next event seems to be a farm so I might've screwed myself over with Miranda (though I do have Awakened Bernice and Gellius already).