5 is a lot of manas. I get that they're all Shops-friendly mana, but it seems like if this was strategically strong we would be seeing more Expedition Map currently. It seems like this would be most playable if you have some way to bounce or recur it, so you can get a stream of Strip/Waste effects (in addition to whatever utility lands and further Factories / Shops / etc)
This also gets you around the 1 land per turn thing. Places where this can shine that Maps cannot include:
- Can fetch Bojuka Bog for Dredge hate
- Can be a recursion target with Forgemaster or Welder
- Can get eye of Ugin for explosive Eldrazi turns
- Can get tabernacle in lands based decks
- Can get maze of ith to stop mairt large from eating you
I suspect in other formats doing things like fetching a second flagstones to legend one out and getting an untapped land is also viable.
This guy is a much better late-game topdeck than Expedition Map, and since Shops struggles most in the late game, I can't completely discount Golos being useful.
Still, I struggle to envision running Golos over some other five-mana finisher.
PS: I'm surprised nobody yet has suggested running a miser's Crystal Quarry to go with his activated ability.