Specter of Death's Continuity

Indestructible, Deathtouch, Menace, Reach
Specter of Death's Continuity costs {1} less to cast
for each Black creature you control.
Specter's Harvest—At the beginning of each
upkeep, destroy target nonland permanent. It
can't be regenerated. If there are no permanents
on the battlefield, each player discards a card and
loses 1 life.