I don't think we will ever see
Mutavault, at least not the 'all creatures' part, but the rest of those don't seem difficult at all. The last three are just changing numbers in
Treetop Village and
Blinkmoth Nexus is just changing numbers for
Mishra's Factory. (Things might be a bit more complicated than that, but I don't see how at this point)
I think I did this once before, but here's a few lands I'd like to see for that challenge specifically:
Blinkmoth Nexus (manland)
Deserted Temple (reuse cool lands like
Maze of Ith)
Faerie Conclave (manland)
Forbidding Watchtower (manland)
Ghitu Encampment (manland)
Gods' Eye, Gate to the Reikai (Not that useful, but looks fun :p)
Halls of Mist (might be able to borrow
Wall of Dust's affect)
Heart of Yavimaya (similar to
Pendelhaven)
Horizon Canopy (Probably the only dual land not strictly inferior to its Alpha cousin, and this one might actually be better)
Ice Floe (creature control)
Kor Haven (creature control)
Mutavault (even if approximated as a 2/2 vanilla)
Nantuko Monastery (manland)
Petrified Field (reuse strip mine, or just regrowth anything in the deck :p)
Quicksand (creature control)
Riftstone Portal (very useful land)
Rishadan Port (epic in many formats)
Shivan Gorge (direct damage, I like using one in many monored direct damage decks)
Stalking Stones (mostly obsolete due to the
Gargoyle Castle we just got, which was very useful, but more is better!)
Svogthos, the Restless Tomb (this is just cool, though expensive)
Tolaria West (tutor for any land in land ho!)
Urza's Factory (make creatures)
Vitu-Ghazi, the City-Tree (make creatures)
Yavimaya Hollow (regenerate manlands)
Zoetic Cavern (manland, sort of. could be coded by asking for a choice between land or 2/2 when casting, and if you choose a 2/2, have a (2): this becomes a land permanently)