Rhys, the Evermore is a rare Legendary Creature — Elf Warrior card from Lorwyn Eclipsed (ECL), collector number 32. Current market price: $0.23 (foil $0.33), TCGplayer market prices via Scryfall.
Flash When Rhys enters, another target creature you control gains persist until end of turn. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.) {W}, {T}: Remove any number of counters from target creature you control. Activate only as a sorcery.