Generally want to mulligan for Oaken, Aquatic, Ramp, Psychmelon, and Discover with the deck, but I find that just looking for Oaken/Psychmelon and letting the pieces fall into place works best. This deck is by no means good into a lot of the aggressive meta decks right now yet feeds on a lot of slower decks, BUT you can still win if you get the right cards early on. Might personally cut naturalize from the list and try to slot in a swipe or two to combat token decks.