Warden of the First Tree is a mythic Creature — Human card from Fate Reforged (FRF), collector number 143. Current market price: $0.37 (foil $0.54), TCGplayer market prices via Scryfall.
{1}{W/B}: This creature becomes a Human Warrior with base power and toughness 3/3. {2}{W/B}{W/B}: If this creature is a Warrior, it becomes a Human Spirit Warrior with trample and lifelink. {3}{W/B}{W/B}{W/B}: If this creature is a Spirit, put five +1/+1 counters on it.