Oswald Fiddlebender (Ampersand Promo) [Dungeons & Dragons: Adventures in the Forgotten Realms Promos]

Magical Tinkering — {W}, {T}, Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle. Activate only as a sorcery.