GB Enchantment feat. Yakkapult
Yakkapult is a solid win-condition that allows you to fall back and focus entirely on defense, winning the game from a distance. Control the board with gigantic walls without leaving yourself open. If you succeed in this gameplan and play conservatively you can also OTK with Yakkapult, else just buffing it to 2/9 and then enchanting it to 9/9 will win the game in two attacks if the Angry Yaks manage to hit the opponent even once.
If you draw multiple Yakkapults, don't worry, just summon them adjacent to your orb and pick away at any defenses your opponent tries to use.
The deck can still win using buffed Willows or Octopuses. Wood Elemental can also be buffed but it's intended to be used as land ramp to summon Yakkapult more quickly and as a taunt to protect it from the opponent.
I'm not using Flowers or Frog-Tossers but relying entirely on battle and gigantic creatures, this does make you weaker against Blue *cough*Frogify*cough* but it's stronger against Yellow, Red and other Green decks.
This deck is supposed to be play very conservatively, farming its own wells and only advancing if the opponent is weak, the longer the game drags out the higher are your chances of winning with Yakkapult.