Shimmercreep is a uncommon Creature — Elemental card from Lorwyn Eclipsed (ECL), collector number 120. Current market price: $0.18 (foil $0.23), TCGplayer market prices via Scryfall.
Menace (This creature can't be blocked except by two or more creatures.) Vivid — When this creature enters, each opponent loses X life and you gain X life, where X is the number of colors among permanents you control.