Felicia, The Carnivorous One

Undergrowth — Mill cards equal to the number of creature cards in your graveyard. Return up to
three cards milled this way from your graveyard
to the top of your library in any order.
Whenever Felicia blocks or is blocked by a
creature with less toughness than it. Destroy that creature at the end of combat and create a food
token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")