Karlach and A Great Background

I'm sure this has been posted before, but I'm really struggling to pick a background for everyone's favorite burning hot Tiefling. I've been waffling between a few background choices for like a month now and can't seem to pull the trigger on any one of them.

I would love any suggestions or advice to sway me any one way between Haunted One (great buffs, bad tribal options), Cultist of the Absolute (great buffs, worried about not drawing sac outlets), Guild Artisan (treasure but lacks options other colors would offer and could be in the 99), Hardy Outlander (good but not as appealing as the other choices), and Sword Coast Sailor (unlockable, but Gruul and Rakdos are likely better options).

I'd anyone has other commander and background combos that are fun and interesting I'd love to hear those too. I find the mechanic super interesting.

Thanks!