Infinity Thanos is probably the best boss fight design in this game's history
This is the best boss fight design in the history of this game and this is because:
A) There is no RNG
All his abilities can be predicted with pinpoint accuracy. You can read what's coming, you can see it, you have the timers to indicate when it is coming and then the outcome has no RNG attached to it. Brilliant!
B Free Practice Runs
I have to admit that the Guillotine fight last month was also well designed and was at appropriate level for uncollected. However, it was marred by the fact that you had to spend somewhere between 78 to 99 energy just to reach her. And when you reached her 5 hours after starting the quest, there was no will left to practice and quit on her. So, I just used "safe" god tier champs and powered through using a revive or two if needed. Same issue is in LOL where there is no room for experimentation unless you are willing a pay a steep cost.
This is where it is so good this month. You can have 4 to 5 practice runs on Thanos' in one full energy.
C) No "**** you, I win" button on Thanos
The first difficult boss fight that came into the game was Act 4 Maestro. Before him, it was simple parry / dexterity, smash to oblivion. This was the first time you had to plan. He required champs that could stop healing or nullify it. It required players who could time their dodges perfectly to his sp1. He had the means to destroy perfect block teams, the go-to strategy of that time.
Fast forward to 5.2. The Collector. Unblockable specials that are impossible to dodge. Ability that reduces ability accuracy over time so no power control. Goes unstoppable without notice in the middle of your combo. Even if you play him with top skill, at some point the Collector just goes "ok **** you, I win". And that really isn't enjoyable. This was also the era of LOL Maestro who has similar mechanics for certain classes. Plus the enrage timers achieve the same thing.
Thankfully, I can see a shift away from that design. We had 5.4 Ultron who can be soloed (but still has the broken evade). Then came Uncollected Guillotine last month. First truly hard Uncollected Event Quest boss who didn't have unavoidable damage. She was simple and good. Thanos is continuation of that. He is complicated and brilliant. He does get free sp3s but you can eat 4 of them with any champ, 10 with avengers, 20 with iceman and unlimited with duped gwenpool. That is a bit of damage-gate I suppose as you have to kill him quickly in that phase before he gets too many sp3s, but I am willing to give it a pass as we have fair bit of choice in the tools that we can use.
I see a lot of threads on BS bosses and there is a lot of negative feedback on things that have gone wrong in the game (**gold shortage**), so I thought we should have positive feedback on something that we like.