Starfall Wastes

Starfall Wastes enters the battlefield tapped.
As an additional cost to play this card exile
target land you control.
Whenever a land enters the battlefield you may pay {1}{x}{x} to exile it, where X is equal to the number of lands exiled this way.
{t}: Add {b} or {c}
{t}: Add X mana of {c} or {b} in any configuration.