Prosperous Innkeeper is a rare Creature — Halfling Citizen card from Secret Lair Drop (SLD), collector number 878. Current market price: — (foil $2.18), TCGplayer market prices via Scryfall.
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Whenever another creature you control enters, you gain 1 life.