Black Hills Forest

Black Hills Forest enters tapped.
{t}: Add {b}
{t}, Discard any number of cards from your hand: Add {b} to your mana pool for each card discarded this turn. You lose 1 life for each mana added this way. Activate only as a sorcery.
{1}, {t}: Create a map token.
{2}, {t}, Sacrifice a map token: Each player draws a card, then discards a card.
{t}, Sacrifice a map token and discard a card: Remove target attacking creature from combat.