Eldraine, Dross Fallen

When you play this land, sacrifice all nonblack
permanents you control
{t} add {b}{b}, activate only if you've sacrificed
three or more creatures this turn
{4}{p/b}{p/b}{t} Destroy x nonblack creatures,
where x is the amount of life you've lost this
turn, activate only if you control 4 or more
swamps