Dark Plains

({t}: Add {w} or {b} to your mana pool)
Dark Plains enters the battlefield tapped.
{1}{t}: Add {w}{b} to your mana pool.
{1}{ut}Sacrifice a land: Add {w}{b} to your mana pool.
{t}Sacrifice: Draw a card, play a land from
your hand tapped, gain 20 life, add {w/b}{w/b} to your mana pool.