Dark Jeroid

Ingest
Morph {p/b} or {p/r}(You may cast this face down
as a 0/2 creature for {1}. Turn it face up any time
for its morph cost.)
When this is turned face-up, target creature has
-X/0 for as long as you control Dark Jeroid. X is
equal to the number of creatures in exile that the
targets controller owns.