At first glance it seems like you have a lot of extra mana. 25 lands and 12 mana ramp for a deck with an average cmc of 2.54. You may want to consider getting rid of some of the mana ramp. Perhaps for Fog

Oooh, That might need to happen. But on the other hand... I really like having alternate mana sources for when I get Life and Limb out, and all my mana sources can die by blocking, so a lot of them are kind of necessary... But you're right, maybe fog would do better in this deck than... say, Llanowar Elves ? Thanks, will consider at least.

What about getting rid of Fertile Ground as opposed to Llanowar Elves ? You can't really use the "of any color" in this deck and this way you keep chump blockers for early game in as well as the 1 cmc vs the 2 cmc. Just my 2 cents

Alright, fair enough. It's just I like the possibilities that arise when you have multiple fertile grounds on a forest and can untap that forest with arbor elf. but you're right, it's not very efficient.

Scapeshift and Rampaging Baloths might be good, considering your running a landfall card Sporemound . Also maybe Seer's Sundial ?

And if your running Arbor Elf , Overgrowth is a good addition. 7 mana by turn 3? A really nice, inexpensive ramp.

I thought about the Rampaging Baloths , but I simply couldn't find any. I replaced them with Turntimber Basilisk . I like the Overgrowth and Scapeshift ideas, though. I just wish I could get a hold of them... thanks for the input!

You know that creates an infinite combo that ends the game immediately in a draw. You cant stop the combo.

I'm not well versed in infinite combos, but is it possible to wait something like, an arbitrarily large number of repetitions and then Nature's Claim?

Yes, that is why the instant speed enchantment removal is in there.

Also, the pieces of the main combo are Sporemound , Life and Limb , and Blasting Station . The first two do generate an infinite combo when you play a land, as each saproling enters the field as a land as well and therefore generates another one, but since each triggers the next one, you can blasting station in between each one, and deal infinite damage through that.