Vivien on the Hunt (162) [Prerelease Cards]

+2: You may sacrifice a creature. If you do, search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put it onto the battlefield, then shuffle. +1: Mill five cards, then put any number of creature cards milled this way into your hand. −1: Create a 4/4 green Rhino Warrior creature token.