So with the new Raid mode and Grails, we'll finally be able to merge free units we love! Which ones will you shoot for first?
LA!Eliwood is currently a popular idea, since he's a 175 BST Blue Armor that you don't have to gacha for. Pretty good for Arena scoring. Then there's Masked Marth, who is just 2 copies away (I believe) from +10. Black Knight also seems like a good idea.
I'm just going to wait for the upcoming free Azura to be added to this...