Demogorgon, Abyssal Prince

Menace, Double Strike
When Demogorgon, Abyssal Prince
enters the battlefield, or attacks, mill three cards.
Whenever you mill a creature card, create a 3/2 Barlgura creature token
Whenever you mill a non-creature spell,
draw a card
Whenever you mill a land card, add {b}{g}{u}. You
do not lose this mana as steps and phases end.