Eriette, the Beguiler is a rare Legendary Creature — Human Warlock card from Outlaws of Thunder Junction Promos (POTJ), collector number 202p. Current market price: $0.34 (foil $0.51), TCGplayer market prices via Scryfall.
Lifelink Whenever an Aura you control becomes attached to a nonland permanent an opponent controls with mana value less than or equal to that Aura's mana value, gain control of that permanent for as long as that Aura is attached to it.