Emptiness is a mythic Creature — Elemental Incarnation card from Lorwyn Eclipsed Promos (PECL), collector number 222p. Current market price: $0.88 (foil $3.93), TCGplayer market prices via Scryfall.
When this creature enters, if {W}{W} was spent to cast it, return target creature card with mana value 3 or less from your graveyard to the battlefield. When this creature enters, if {B}{B} was spent to cast it, put three -1/-1 counters on up to one target creature. Evoke {W/B}{W/B}