What makes Solitude so powerful in Modern is that the format is slow enough and the lack of Wasteland means that youre usually hardcasting them instead of evoking them, which when you combine it with blink effects like the previously mentioned Ephemerate and Yorion, Sky Nomad, is an extremely potent card advantage engine
If you want to build around K'rrik specifically, however, you can use him to helm a very strong life manipulation deck or generically good combo or control deck
Instead of burning players for playing cheap spells, however, Mai burns them for playing noncreature spells
I have placed it very high up on my own list as well, but I am not sure whether I really think it is better than Veil of Summer or Force of Vigor, given that it is just a dumb, head-through-the-wall type card and the others are very specialized but devastating interactive cards
Trygon Prime is the only new one here, and its pretty okay