Woodborn Behemoth is a uncommon Creature — Elemental card from Magic 2014 (M14), collector number 203. Current market price: $0.09 (foil $0.25), TCGplayer market prices via Scryfall.
As long as you control eight or more lands, this creature gets +4/+4 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)