Midway, Airfield Princess

Midway, Airfield Princess enters the battlefield tapped.
{t}: Add {u} or {b} to your mana pool.
{1}{u/b}{x}, {t}: Create X 1/1 black Abyssal creature tokens with flying. You lose X life.
"So you've come...again...incautiously......fufu...fu...
Fool...! Such overconfidence... you shall sink again,
and again..."