Orochi's Appetizer

Demon offering (You may cast this card any time
you could cast an instant by sacrificing a Demon and
paying the difference in mana costs between this and
the sacrificed Demon. Mana cost includes color.)
{b}, Discard a card, Pay 1 life, Put the top card
of your library into your graveyard, Sacrifice
Orochi's Appetizer: Put a +1/+1 counter on
each Demon you control, then proliferate if
you control a card named Yamata No Orochi.