Pandemonica, the Tired Demon

Pandemonica, the Tired Demon enters the battlefield tapped and doesn't untap on your
untap step.
Whenever a food enters the battlefield, untap Pandemonica, the Tired Demon.
{t}{b}{r} sacrifice a food: Exile Pandemonica, the
Tired Demon and return it transformed under its
owner's control at the beginning of the next end
step.