Anyway, I know Sydri kind of already does this, but redundancy is a good thing, and this will spell insta-scoop from most opponents because of their inability to play lands while Mycosynth Lattice is on board.
Card:
March of the Machines.
Pros:
+Saves you mana in the long run.
+Combos with Mycosynth Lattice to keep opponents from playing lands.
+Harder to remove than Sydri due to being an enchantment.
+Having redundancy in your effects is powerful in Commander.
Cons:
-You also cannot play lands with Mycosynth Lattice on board.
-Some opponents can benefit from this as well.