@evouga Pioneer loves the crap out of these. My Jeskai Ascendancy/Emry deck will use these to replace 4x lands pronto.
They can still provide value in a ton of ways. Wrenn and 6 or Crucible of Worlds seems great. Something like Landstill could easily just run 2-3 of the Temur one to splash any Red/Green needed, and can cycle then play them thru the aforementioned cards.
These are insane in all formats without access to the original dual lands. The ability to cycle these when topdecked in the late game really puts them over the top.
I could see Jeskai running one of these to smooth things out a little, but overall probably not a big impact on Vintage. Kind of insane that they made these, though.