I feel like Shambleshark is underwhelming here. The flash is cool but you don't have many things to make the flash relevant. If you had 2 CMC instants you would want to bluff or use it would be good, but your build tells me you want to tap out each turn for more dudes and more evolve. Experiment One may be better because it starts evolving faster and it's resilient.

Good point, I've thought about Experiment one, but my main problem is that he gives no blue devotion. Even though this deck is part green, every permanent I have has blue because I need that devotion. I ran Polukranos at one point, and he didn't do very well. Maybe I'll put some in if I can find them (My brother runs a green devotion and took the few we had.)

And I have the Shamblesharks in there because they're two-drop two powers that can get bigger. The one toughness guarantees that he will evolve with anything I play that has at least two toughness (which is most creatures in my deck), and with things like Thassa and Frostburn, he can get pretty big.