You might want to consider adding some mana rocks/dorks to quicken play a little bit. I playtested a time or two and that was really my only issue. You do have a lot of land though, so maybe something like Sakura-Tribe Scout could be added.

_raeofsunlight: Thanks for playtesting it. I'll consider adding some rocks. I have never thought about that before, and it might actually be useful.

Sakura-Tribe Scout isn't as great as it seems though. It's a useful card for decks that want to abuse landful and do have 26+ lands. For this deck, where I have 23 lands, it isn't even a dork speaking mathematically: If you can use the ability every turn to put an additional land into play, it is an Elvish Mystic. But if you can't, it's significantly worse. And in a deck with only 23 lands, four Sakura-Tribe Elder and four Terramorphic Expanses, I'll very rarely have two lands in hand for more than a turn or two per game. Additionally, the deck doesn't exactly play very aggressively, so maybe triggering it once or twice in the early turns doesn't win me the game at all. It's a good suggestion though, but as you might guess from my response, I've had it in an earlier version of the deck and made exactly the described experience.

I just realized I'll have to update the description, as some big parts of it aren't reffering to the current version of the deck.

the way i like side sideboard is having cards to make a deck ore controlling for matchups that will go long. i would put Negates and maybe something like Rapid Hybridization or Reality Shift into the sideboard along with something like Distant Melody for card draw in the late game to go more controly. graveyard hate and artifact/enchantment hate should fill up the rest of the sideboard. i think that Ground Seal is an underplayed card and doesn't affect your graveyard plan at all. Creeping Corrosion and Reclamation Sage are good artifact hate.

Asder: great board suggestions, thanks :)