Just beaten LoR. I unironically struggled far more with Distorted Ensemble than with the Keter Realization wtf

I have three questions:
>What's the best Argalia deck I can make and the recommanded passives for it? Currently using Dark Blade or whatever Sayo's passive is called for early draws
>What's the strat to get the Arbitating the Arbiter achievement? Roland fucked me over by lowrolling Furioso against Zenner's Shockwave and fucking died
>Is there a strat about those Unity pages you get (the ones with Loland and Angelica in the art)? Those pages don't look like much to me