+10 marth build

I'm pretty sure that Marth is a support unit, Drive Spd or Def would be great for C/S skill. Odd Atk Wave is pretty expensive tbh.

Why not flashing blade instead of heavy blade? With 51 Atk, he will only be activating that skill against a small percentage of units on even turns. Even at 58, that's right on the border of reliable activation. A lot of buffed armors in arena go to 60+ Atk.

i just made my marth a +10 recently, and this is the build i have for him if you want it for consideration.. i’m considering giving him odd attack wave as well, and i think if you don’t mind giving him such an expensive skill then go for it. he looks pretty good, i think i’d change the seal to either flashing blade or a drive skill, but it’s up to you. my marth also supports L!Tiki and H!Myrrh so i chose drive def as opposed to drive spd. hopefully i can score on some attack wave fodder though

Swap to a dual rally for optimal scoring. Other than that looks perfect.

Maybe run a chill in B-Slot so your bonus unit has an easier time getting kills.