Souldrinker Cleric

{b}{b}{b}Exile the top ten cards of your library
putting a soulless counter on each creature exiled
this way. Create a 9/9 black demon creature token
with Flying and Trample.
Whenever a Demon you control dies, create a
copy of a card with a soulless counter on it with
lesser power. That creature is a Demon in
addition to its other types.