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
The card allows players to cast their Equipment and Auras at instant speed, and attach their equipment as soon as it enters play, without worrying about its equip cost
Would Haakon be a decent lord if most of the Knights were white
Squadron Hawk ain't nothing
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
Instead of burning players for playing cheap spells, however, Mai burns them for playing noncreature spells