Guess I'd have to see it played. While Contaminated Ground falls within the purview of Land Denial, the deck seriously lacks solid land destruction at a lower cost. This looks like a golgari tempo deck, which makes for an interesting proposition. If that was the case, I'd recomend adding a few Golgari Chams to the mainboard. It's currently a card that will put this deck firmly in the drivers seat. Stops Supreme Verdict, Eidolon of Blossoms, and Launch the Fleet. That type of flexibility and utility should be maindecked.

I'll make my proposed R/G version. Even having access to Peak Eruption in the sideboard is something I feel the deck really has going for it.