Sadly, doesn't work. The key part that makes Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth work is "in addition to its other land types".

Blood Moon, Conversion, Glaciers, Illusionary Terrain, and Song of the Dryads don't have that text, so they'll only be one type at a time :/

Urborg and Yavimaya do stack to make forest+swamp+whatever though. I'm sure in a couple years, we'll have versions of those lands and this can be fully realized.

This looks fun! I was also amused by I-HaveNoManaAnd-I-MustScream's comment. I think you might just have to deal... :P

As far as mana ramp goes: Arcane Signet, Dimir Signet, Talisman of Dominance are all great cheap rocks that should be run in pretty much every deck that can (or their other-color equivalents). I'd make slots for these first, before higher CMC pieces.

Fellwar Stone can also be perfectly viable, depending on your table and what people run. If no one runs blue/black, maybe take Thought Vessel instead.

GL, HF!

Rogue's Passage would fit in well here.

Looks fun! I agree, Phyrexian Altar et al. make infinite combos way too easy.

Night Soil might be good if you need more graveyard destruction. Basically a second Necrogenesis, but hits more cards for less mana.

Verdant Embrace might also be okay? With your commander able to return from death so easily, getting 2-for-1'd might be worth the risk.