Obama, Hope's Pariah

Whenever one or more enchantments or
artifacts enter the battlefield under your
control, add {b}, {g}, or {w} to your mana pool.

Whenever you would lose unspent mana, each
player loses life equal to the amount of unspent
mana that was not produced by a land. If the
total amount of life lost this way is greater
than the number of nontoken, nonland
permanents you control, draw a card, then
discard a card.