The Great Forest

Champion a Treefolk then clash with an opponent. If you win, create a 0/2 green Treefolk Sapling creature token with defender.
{t}: add {g}, {w} or {b}.
If you control a Treefolk creature, forests
you control have: "{t}: add {g}{g}. Spend this mana only to cast Treefolk spells."
The Great Forest can be your commander.