Orochi's Appetizer

{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. (Choose any number of
permanents and/or players, then give each
another counter of each kind already there.)