Crucible of Worlds + World Queller is a good way to keep the land count low. Each turn you can opt to force all players to sacrifice a land, then just play the sacked land from your graveyard with Crucible of Worlds' passive ability. You can use that sacc-and-play combo to trigger Khalni Heart Expedition which will allow you to continue to gain lands while others stagnate or lose them. That, Deus of Calamity, Mwonvul Acid-Moss, Acidic Slime... maybe Reap and Sow... you could have yourself a nice Green-White deck. But that's just me.
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Dude, you've got 40 'lay waste'. Not only is that illegal, it's also a damnable waste, but I assume that was just a typo. If you're out to destroy lands, there are more efficient combos than that, and they'll clear the board quicker too. I'll draw up some of the crit cards in another post.