Glamdring, Foe-hammer (HOB-174) - The Hobbit

Instant and sorcery spells you cast cost X less to cast, where X is equipped creature's power.

Equip 2

Gleam of Death 3U

Sorcery — Adventure

Mill six cards, then put all instant and sorcery cards from among them into your hand. (Then exile this card. You may cast the artifact later from exile.)