With Green, you have a handful of fighting creatures like Wicked Wolf, Thorn Mammoth, and Kogla, the Titan Ape, but they're fairly scarce on their own
Gilded Lotus is really, really good in the right circumstances, but its high mana cost means that you have to carefully consider if you really need the big mana income that Gilded Lotus offers
Green's got a pretty cool flavour in representing a "nature rejects the artificial" theme, with Argothian Pixies , from Argoth Forest, being a creature that's more powerful in fighting against Artifact creatures
Its a nightmare for blue decks, and it synergizes beautifully with other cards in Rakdos Midrange or Yawgmoth lists that love incremental value and pressure
That extra ten dollars will also do some extra special good