Back when I was playing 3.0, that was my favourite game mode. Is there a reason on why it was scrapped?
Basically the mode involved everyone having a grinder and no units (or was it higher tier units?) available to be built, and one had to grind the random units from crates to "research" them. I can see how it relies too much on rng (esp getting the nuwa cannon) to be competitive, but I think it's fun once in awhile. There also seems to be no mention of it in the wiki or patch notes as far as I can tell, which is quite strange.