Tezzeret is a planeswalker who wields blue magic. His specialty is artifice: spells that forge artifacts, manipulate artifacts, and even bring artifacts to life.
Tezzeret was a talented artificer from the Alara shard of Esper. Like all Esperites, he has part of his body "enhanced" by the magical alloy etherium, part of an overarching planar venture to create perfection of both body and mind.
Tezzeret became an initiate of a mage sect called the Seekers of Carmot in order to gain access to the Codex Etherium, a sacred tome the sect claims to have in its possession. When he intruded into the sanctum of the Seekers, he uncovered truths that others didn't want him to find, and he found himself trapped in a conspiracy much larger than himself.
Mortally wounded by the guards of the Codex Etherium on the shard of Alara called Esper, Tezzeret's spark ignited, hurling his battered body through the Blind Eternities to Grixis, where he laid dying. Revived by the scheming dragon Nicol Bolas, Tezzeret was forced to accept servitude in exchange for his life.
Bolas allowed Tezzeret to believe he had seized control of part of his network, a cabal known as the Infinite Consortium. On the plane of Ravnica, from which Tezzeret led the Consortium, he recruited fellow planeswalker Jace Beleren, hoping to use him as a powerful pawn. But Jace had other ideas, defeating Tezzeret in combat and erasing his mind almost completely. Bolas retrieved his servant's body from the æther, rebuilding it for a sinister new task.
Later, Bolas sent Tezzeret to the plane of Mirrodin to observe the growth of Phyrexia, report its progress, and prevent leadership from taking hold. Tezzeret, using his wit and guile, established himself within the Phyrexian hierarchy. As always, he watches for an opportunity to gain power and turn the situation to his advantage.