Cult of the Abyss

You cannot cast Cult spells.
As long as you control two or more cultists,
Cultists you control have: Sacrifice this creature:
Draw a card.
As long as you control five or more cultists,
Demons you control have +1/+1.
As long as you control ten or more cultists,
Cultists you control have: Sacrifice this creature:
Search your library for a demon card, shuffle
your library and put that card on top of it.