| Another option would be to monkey with the notion of colored mana a bit.
Ponder for the moment that instead of actually using land cards, that for each of their first & second main phases you gain colorless mana equal to the turncount (i.e., on your first turn, you gain 1 colorless mana during each phase, during your 5th turn, five, and so on). (this mana does not cause manaburn)
On your first turn, you declare one color as your Totem color, and any colorless mana you gain can be spent as if it were that color.
If you want to use a second color of mana, or you want to be able to cast spells outside of your main phases you add non-basic land and/or non-land mana sources to your deck. | 
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