Vedalken
Native to Mirrodin, Ravnica and the Alara shard of Esper. The Vedalken are bald, blue-skinned humanoids with strictly structured minds and a tendency towards logic, research, politics and rule of law. They tend to have a certain private disdain for other races, instinctively viewing them as somewhat inferior. On Ravnica, Vedalken are primarily drawn to the bureaucratic Azorius Senate or the freely scientific The Simic Combine. In Esper, on Alara they are one of the two most common beings, the other being humans, and are all infused with the magical alloy etherium, making them colored artifacts.
The Vedalken were one of several races brought to Mirrodin by Memnarch in his efforts to populate the barren metal plane. Of those races, the Vedalken have evolved more than any other thanks to their extensive use of "Blinkmoth Serum," a substance that expands the user's mind and expedites their evolution. On this plane, the Vedalken have evolved a second set of arms (a mutation occasionally seen among some particularly successful Simic graftmages on Ravnica), as well as amphibious tolerances and the need for mechanized "serum suits" which constantly infuse them with the drug. They are also the only race on the plane with long-term knowledge of Memnarch and his agendas, a reward Memnarch grants them for their usefulness as puppet masters among the various races. Based in Lumengrid, an artificial island far out on the Quicksilver Sea, Mirrodin's Vedalkens have a strict democratic government with blue-aligned humans (the "Neurok") kept as a slave class.
In the set Shards of Alara, the vedalken populate the shard of Esper, sharing the shard with humans and sphinxes. Eventually, the vedalken formed the Ethersworn, a group dedicated to infusing all life on Esper with a material called Etherium. They do the bidding of the sphinxes, who use the vedalken as a puppet regime in ruling Esper.
(Vigean Graftmage, Vedalken Mastermind, Azorius Guildmage)
Read more about this topic: List Of Species In Magic: The Gathering