Myrrh +atk -def

If you like her, then yes. You can always look for a better one to merge into later on.

If I had those IVs and only one of her I would go all out on capping her atk and then just giving her vantage. Say LnD or brazen atk/def. screw logic and play how u want. I do have his build to almost all my atk+ units who have decent to amazing atk stats to one hit retaliate kill before they can kill u first. I once had a atk+ 10 merge Lgrima with flier buffs with Camilla giving grima over 100atk with vantage/ natural DC and no weapon disadvantage against anyone unless running raven TA