Goat's Nemesis

Flying, haste, ravenous (This creature can't attack unless you've sacrificed a creature or Food this turn.)
When Goat's Nemesis enters the battlefield, create a 0/1 white Goat creature token.
{1}, Sacrifice another creature: Create a Food token. (It's an artifact with "{2}, {t}, Sacrifice this artifact: You gain 3 life.")