Null Butcher

Suspend 10 {1}{b}{b} (Rather than cast this card
from your hand, you may pay its Suspend cost and
exile it with 6 time counters on it. At the beginning of
your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.)
Null (This creature has protection from colours.)
Whenever a creature dies, remove a time counter
from Null Butcher.