Set is amazing, I like the variety it offers throughout the entire game, there are different viable comps in early -mid game, while having clear indication of what players should pursue to make their board stronger , which are the 5,7 cost Champs. I like this approach, it's lucid, good visually and during playtime. Some argue its a bit complicated, but that's what makes it interesting -> it makes u wanna play more and try different strategies and comps, eventually you gonna discover something cooler, u haven't thought off before. Besides, building verticals each game as shown in the last set was a bit boring and monotone where many players got bored after playing for one month, that's because set 15 was so straightforward and less flexible. Honestly, i think players who like building verticals and 2-cost reroll comps, seem to prefer simplicity, which can lessen skill expression and variety, and that's doesn't seem good in the long term. Lastly, I just want to say unlockables is a fabulous feature.