Delighted Halfling is a mythic Creature — Halfling Citizen card from The Hobbit Commander (HOC), collector number 25. Current market price: $25.31 (foil $28.67), TCGplayer market prices via Scryfall.
{T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a legendary spell, and that spell can't be countered.