Elvish Harbinger is a uncommon Creature — Elf Druid card from Tales of Middle-earth Commander (LTC), collector number 527. Current market price: $5.51 (foil $7.03), TCGplayer market prices via Scryfall.
When this creature enters, you may search your library for an Elf card, reveal it, then shuffle and put that card on top. {T}: Add one mana of any color.