There's no way an Axe Grid is worth Ori. Aim for Hammer/Glaive/Lance/Bow Grids.
For Veterans who have all the Envy Axes, an Axe Grid is alright. You don't really gain or lose actual damage because what you gain in base Atk you lose in Assault. All you get is basically get a free Elaborate(++) and Exceed(++), which... honestly, isn't much. Still, why not if you already have all the ingredients. But please, don't spend Ori for a Grid like that.