Earthcraft is the best source of mana to fuel a number of infinite combos involving Doubling Season, Cathars Crusade, The Meathook Massacre, and Corpse Knight, among others, but these cards only scratch the surface of your combo potential with this commander, so if thats your preferred style of play, the linked primer above is going to be your best starting point for deck construction
Even so, my tactics clicked for me, scoring me wins most of the time
If your deck is focused on casting noncreature spells, Vivi Ornitier can only make it better
With a history like that, you know energy cards are powerful, but which are truly the best
You can get domestic woods, and have far more exotic options, like walnut burl and African teak at the upper end
It has such a useful range of abilities, the problem being that it only fits in these specific 3-color decks