Gnarlbark Elm is a uncommon Creature — Treefolk Warlock card from Lorwyn Eclipsed (ECL), collector number 103. Current market price: $0.11 (foil $0.26), TCGplayer market prices via Scryfall.
This creature enters with two -1/-1 counters on it. {2}{B}, Remove two counters from this creature: Target creature gets -2/-2 until end of turn. Activate only as a sorcery.