Crumbling Conclave

Crumbling Conclave enters the battlefield tapped.
{t}: Add {u} to your mana pool.
{t}, Pay 1 life: Add {b} or {r} to your mana pool.
{3}{u}{b}{r}, {t}, Sacrifice Crumbling Conclave:
Each player draws 2 cards, then loses life equal to the number of cards in his or her hand. Activate this ability only any time you could cast a sorcery.