Make it jund colored and have black bombs as you only need a splash really and there are enough dual lands/ color fixing in green that you can cast them and tutor for your spell. Seems like the best plan imo.
Craterhoof Behemoth is a musthave for this deck. No reason not to have him in, as everything that hits the board is coming in for stupid amounts with trample. (And if Urabrask is there everything has haste as well)