Arwen, Weaver of Hope is a rare Legendary Creature — Elf Noble card from Tales of Middle-earth Commander (LTC), collector number 437. Current market price: $17.37 (foil $31.33), TCGplayer market prices via Scryfall.
Each other creature you control enters with a number of additional +1/+1 counters on it equal to Arwen's toughness.