Herd Heirloom is a rare Artifact card from Tarkir: Dragonstorm Promos (PTDM), collector number 144s. Current market price: — (foil $6.76), TCGplayer market prices via Scryfall.
{T}: Add one mana of any color. Spend this mana only to cast a creature spell. {T}: Until end of turn, target creature you control with power 4 or greater gains trample and "Whenever this creature deals combat damage to a player, draw a card."