Malicious Amalgamation

Target opponent discards two cards, then
puts the top four cards of his or her library
into his or her graveyard. Reveal cards from the
top of your library until you reveal a Demon
creature card. Put that card onto the battlefield
and exile all other cards revealed this way.
Gravestorm (When you cast this spell, copy it for
each permanent put into a graveyard this turn.
You may choose new targets for the copies.)