I am currently trying to make showdown work in a jeski xerox deck and am finding 2-3 and 2 teferi to be about the right number. The biggest issue am having is between this dreadhordes, mentor, bolts, and the nessicary artifact hate I am running into low blue card density issues. Any good ideas for counterspells that can help make up for not running FON in the shops matchup and aren't completely dead otherwise?
I actually like the idea of the format but I don't think you have any hope of getting it mainstream, you have both the new format issue and the deeply unintuitive rules problem to overcome. However if you ever run a MTGO tournament of it please post on here I would love the chance to take a swing.
I for one am deeply unexcited and uninterested and really wish they just made them once a year silver bordered sets and went really crazy with the mechanics. I don't think it will kill the game but if they keep on making FIRE level bad design choices and aggressively alienating the community with greed we may be in for a looooooooooong slow decline.