I would say the UK market is more player-driven rather than collector-driven, which I think is a healthier state of affairs
Brass's Tunnel-Grinder / Tecutlan, the Searing Rift If you can get all three counters on this thing in one turn so that you can flip Brass's Tunnel-Grinder into Tecutlan, the Searing Rift immediately, thats busted, especially for a burn finish
any one of which could be represented in a March of the Machine Jumpstart Booster
This can lead to plenty of extra mill over the course of a long game, especially in Commander, where this adds each-opponent mill to any instances of single-target mill
Solitude can take care of many threats that are just too big for Prismatic Ending, most notably Murktide Regent but also things like Emrakul, the Aeons Torn, and so the two work very well together