Arcane Teachings is a common Enchantment — Aura card from Judgment (JUD), collector number 78. Current market price: $0.23 (foil $1.71), TCGplayer market prices via Scryfall.
Enchant creature (Target a creature as you cast this. This card enters attached to that creature.) Enchanted creature gets +2/+2 and has "{T}: This creature deals 1 damage to any target."