Belrocka, Destroyer of Worlds

Flying, haste, hexproof
Whenever you attack with Belrocka,
Destroyer of Worlds, you may pay
3{b}{b}. If you do, give it +8/+0 and trample
until the end of the turn. Sacrifice it at the end
of combat. Then if you control three or more
Demons besides Belrocka, Destroyer of
Worlds, shuffle it into your library.
Otherwise, exile it.
I drench in your soul. Its fear powers me