I agree that there should be Decays somwhere in the 75.  Before having an opinion on Exploration, I'd like to play some games with it, though.  Watching Kennan Haas playing it was very interesting because he didn't play it at all like I would play Lands.dec - with that deck, in my opinion, if you aren't finding Loam as soon as possile and dredging with it at every given opportunity, you are probably doing it wrong.  Kennan was playing this like a totally different deck - he often used entomb to get something other than Loam, and often drew for his turn instead of dredging a Loam in his yard.  If you aren't on the "loam or bust" plan, then Exploration may be incorrect.