Mizzium

Mizzium is a magic-infused steel alloy used by the Izzet League in a tremendous variety of ways, from providing the physical structure of Weirds to crafting the tools used in other manufacturing. Runic markings help to channel and control the elemental energy that flows through the metal.
The magical properties of the metal are difficult to define succinctly. It is as hard as adamantine, except when it is transformed into a gaseous suspension. It has a high melting point, except when it is found in liquid form at cool autumn temperatures. Izzet chemisters can readily explain that mizzium helps to maximize metasteam potentials, realize fractional element-binding, and transduce local weird-field radicals, but no one understands what any of that means.