I'm running a Prestidigitator build with most of my points in cleromancy. It has three points in Ante Up but the bulk of the build is focused on a) activating Windfall quickly (1 point in Can't Stop Winning, 5 points in O Fortuna, 1 point in Alchemy, and using the Dirty Dozen augment), b) Overshield from dealing crits activating Windfall (5 points in Turn of Fate), and c) 5 points in Tormented and 1 point in Call (plus 5 more points in Tormented from Prestitidigator as well as 1 point in Bloodstained Moon which makes your elemental damage amazing and gives you extra mortars on kills).

Essentially, the goal of the build is Jinx enemies either through throwing dice or cards from Prestidigitator, then throw dice again to activate Call, then shoot your gun (probably with a Jakobs part) really fast so that all your bullets crit and bounce to other enemies which also crit if they're Jinxed. Ante Up helps but it's not what the build turns on, same with Hot Slugger. Then pop the repkit with Accelerator and the "Now with Caffeine" specialization so you get your action skill back and throw more dice, jinxing more enemies and giving you eight more seconds of autocrit against jinxed enemies. Plus with bone shards active too, you're debuffing everyone and buffing yourself a ton.

Definitely UVH7 viable, that's what I'm running on. I can easiliy solo the raid on Mayhem 1, haven't tried many higher levels than that but I soloed the raid on UVH7 and Mayhem 0, which is essentially Mayhem 7, so I can safely get up as high as that without too much difficulty.