Vaedon, Eldrazi Civilization

Vaedon can be your commander. It's colorless.
{t}: Add {c}{c} to your mana pool.
At the beginning of your upkeep, if Vaedon is in your command zone, you may put it onto the battlefield.
{t}: Reveal the top card of your library. If it's a nonland spell with a converted mana cost less than or equal to the number of colorless creatures you control, you may cast it without paying its mana cost.