Crypt of Life's End

{t}{x}: Add X+1 {b} to your mana pool.
{b}{b}{b}: Crypt of Life's End becomes a 2/4 Specter Elemental creature with your choice of Flying, Deathtouch or First Strike until end of turn.
{b}{b}{b}{b}{b}: Create a 1/1 Colourless Spirit creature token for each non-spirit creature that died this turn. When Crypt of Life's End becomes a creature or gains an ability that effect doesn't end. (this effect doesn't end)