The Fallen City

When this card enters the battlefield, destroy all creatures you control, then put X tormented counters on this card, where X was the amount of creatures you destroyed
{t}: Add {b}{r}
{ut}: Sacrifice a creature, put a tormented counter on this card
{b}{b}{b}{r}{r}{r}: Destroy the fallen city. Until the end of turn, cards that have a converted mana value of X or less can be played for free, where X was the amount of torment tokens on this card