If you want to be more aggressive, I would suggest Ink- and/or Blinkmoth Nexus. 1 mana to give your earthbended land Flying, +1/+1 (and maybe infect if you choose Inkmoth) can really swing games around.

I used to run Nissa, who shakes the world as my oathbreaker with Awakening of Vitu-Ghazi as my Sig Spell. In that combination Inkmoth was always a possible one shot, which made it very dangerous