Its front face (the one with the sun symbol in the top-left corner), so Huntmaster of the Fells.
It's a brand new object put onto the 'field, as if you had just resolved it after casting it. It has summoning sickness; it's untapped; it doesn't have any counters, enchantments or equipment; and it's front face is up.
711.5. A double-faced card enters the battlefield with its front face up unless a spell or ability puts it onto the battlefield “transformed,” in which case it enters the battlefield with its back face up.