Quote from user_938036 »Part I: Ravnica at War - Momir - Once I realize I had to make a 3 drop or lose to whatever 4 mana planeswalker my opponent had it was an enjoyable experience. It always sucks in Momir when you are blown out by RNG but its a risk you take playing the format.
Part II: No Escape - Pauper - It was pauper, I played mono red and it was over fast enough that I didn't get bored of playing.
Part III: Storm the Citadel - Singleton - I had wanted to play a stupid Practitioners or Rat colony deck but again fell to mono-red just to get it over with.
Part IV: Commence the Endgame - Counters - I have to say this was the most fun by far. I played a lot of decks trying to find one that really worked. I tried control with Dovin Baan locking down their dreadhorde, I tried superfriends to take advantage of the proliferate, and was WG counters deck for the same reason. I settled on my BG Citadel deck that took advantage of the effect but largely did its own thing.
Part V: Gideons Sacrifice - Ravnica - I tried my gate deck that I built because of budget. It worked and didn't work. Without gates ablaze it was a very uphill battle that wasn't enjoyable. I ended with a simic ramp deck that felt awful but won fast thanks to Nissa.
Out of all of Arena's unique formats, these don't rate as the worst. But Omniscience Draft was by far the best. I think I hated the Cascade format the most.
I'll echo that Omniscience draft is hands-down my favorite variant format on Arena and I will gladly pay full price for it every time it comes up. You couldn't really make it work in paper - it only really works because the bots don't take the variant rules into account when drafting so everyone just has these broken decks throwing haymakers back and forth.