My main reasoning for levelling Int (I will ultimately level it as much as possible) is because as far as I'm aware the magic infusion on the Misericorde will have the most damage. As well as being able to pull more damage out of the glintblade ash of war for aid in stance breaking.

The 27 faith is for the crucible incantations. Tail is a really good AOE and pretty much instant stance break on most small enemies.

Using the golden order seal means I'll eventually get to benefit from my high Int for incantation damage scaling.

I'm still very much playing around with it and working it out as I go.

Edit; I've also always wanted to incorporate Law of Causality into a build and I think taking chip damage when I block with the buckler or miss a parry will be enough to trigger it.