Prosperous Innkeeper is a uncommon Creature — Halfling Citizen card from Adventures in the Forgotten Realms (AFR), collector number 402. Current market price: $1.14 (foil $3.60), 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.