So I got a +spd -hp Katarina from my free pull today...

... and she pitybroke me a while ago, +atk -hp. I don't know why the game decided I have to be so stupidly lucky with this unit.

Anyway, I was thinking, what should I do with her? Should I merge her? And if yes, is +spd better than +atk? Watching her stats she's nothing special for today's standards actually...

edit: you should also know I don't intend to use her other than in Arena Assault I think, so I could as well slap an axebreaker on her to guarentee doubles and therefore keep the +atk one. Dunno