Dragon Fangs is a common Enchantment — Aura card from Scourge (SCG), collector number 117. Current market price: $0.29 (foil $3.19), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+1 and has trample. When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature.