Sage of the Fang is a uncommon Creature — Human Druid card from Tarkir: Dragonstorm (TDM), collector number 155. Current market price: $0.19 (foil $0.29), TCGplayer market prices via Scryfall.
When this creature enters, put a +1/+1 counter on target creature. Renew — {3}{G}, Exile this card from your graveyard: Put a +1/+1 counter on target creature, then double the number of +1/+1 counters on that creature. Activate only as a sorcery.