Ashling, the Limitless is a mythic Legendary Creature — Elemental Sorcerer card from Lorwyn Eclipsed Commander (ECC), collector number 1. Current market price: $0.40 (foil $0.33), TCGplayer market prices via Scryfall.
Elemental permanent spells you cast from your hand gain evoke {4} as you cast them. (If you cast a spell for its evoke cost, it's sacrificed when it enters.) Whenever you sacrifice a nontoken Elemental, create a token that's a copy of it. The token gains haste until end of turn. At the beginning of your next end step, sacrifice it unless you pay {W}{U}{B}{R}{G}.