Woodborn Behemoth is a uncommon Creature — Elemental card from Archenemy: Nicol Bolas (E01), collector number 79. Current market price: $0.28, 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.)