Boulevard of Broken Dreams

When Boulevard of Broken Dreams enters the battlefield, exile your hand and draw three cards.
{t}: add {w}{w}{b}{b} to your mana pool, then exile
your hand and draw three cards.
{t}, {w}{w}{w}{w}{w}{w}{b}{b}{b}{b}{b}{b}: you may play X
cards exiled with Boulevard of Broken Dreams
without paying their mana costs, where X is equal
to your starting life minus your current life total.
A lonely road, the only one known.