Woodborn Behemoth is a uncommon Creature — Elemental card from Duel Decks: Nissa vs. Ob Nixilis (DDR), collector number 26. Current market price: $0.12, 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.)