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I like where you are going with this, but let's be honest, the Evolution Vat is far too situational to put Islands in this deck for. So either scrap the islands and add another Mountain and Forest, or take out the Evolution Vat completely (I don't find its skill in non-EDH gameplay anyway) and throw in some more creatures that benefit from counters, such as a hydra card, with my personal recommendation being Primordial Hydra.Champion of Lambholt would also work very well with this deck.
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I'm also not entirely sure what Slith Firewalker is doing in this deck, since it's not that great of an alternative to Slumbering Dragon. It also further leaves you vulnerable to the possibility of your opponent having protection from Red (Silver Knight comes to mind).It wouldn't hurt to have some removals or other green creatures to help this deck out. You have more than enough cards to supply you with counters, so it may be a good idea to cut some here and there.
You should add a vigor to the deck to make it better.