Council of the Fallen

Council of the Fallen's power and toughness are
equal to the number of cards in all graveyards.
{b}, {t}: Each opponent discards a card. You
lose 1 life for each card discarded this way.
{2}{b}{b}, {t}: Each player sacrifices a creature.
Create a X/X black Demon creature token with flying, where X is equal to the combined power
and toughness of the creatures sacrificed.