Walker of the Grove is a uncommon Creature — Elemental card from Duel Decks: Nissa vs. Ob Nixilis (DDR), collector number 24. Current market price: $0.10, TCGplayer market prices via Scryfall.
When this creature leaves the battlefield, create a 4/4 green Elemental creature token. Evoke {4}{G} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)