Oadhagoth, Umbral Tyrant

As an additional cost to cast this spell, you may
sacrifice any number of creatures. This spell costs
{1} less to cast for each creature sacrificed this way.

Menace, trample

At the beginning of your end step, create X 1/1
black Horror creature tokens with 'When this
creature dies, each opponent loses 1 life.', where X
is the greatest total amount of life lost by an
opponent this turn.