@Lucian I am afraid that Spirits cannot be Planeswalkers as Sparks are destroyed at death, even if their host goes on living in some way. This is why Elspeth is stuck in Nyx and why Karn lost his Spark when he was "compleated" by the Phyrexians as it is a form of undeath. I admire the character, he looks like fun, but it is in direct contradiction with what the canon has put forth.
If you can find a source in the canon that supports your character, then that's fine, but to my knowledge, it is fact that Sparks are destroyed at death/undeath.
Sorin Markov's spark activated upon his transformation into a vampire. Vampires are considered undead. I would consider that at least a canon counter to the claim undead can't hold a spark.
I've taken a shot at asking the question on Blogatog to get confirmation straight from the source about what happens when planeswalkers die. I'll link back if he answers.
Name: Lanestol Age: 35 Gender: Male Home Plane: Innistrad Species: Human Appearance:
Lanestol stands 6' 2", wears light leather armor beneath his black robes becoming of a member of most planes' clergymen. He has a bit of a trimmer stature, on the lighter side of athletic as he relies more on his magics than physical capabilities. Colour Identity: Black/White Powers: Manipulation of life energies (giving and taking), summoning of powerful life-leeching creatures Skills: Staff combat, healing, defensive and evasive movement History:
Lanestol was born on Innistrad, the realm of struggle between humanity and its predators, in the city of Ashmouth in the Stensia province. He started training in magic from his youth from one of the schools under the Church of Avacyn, initially training in healing and preventative magic. He began to work his way up to more advanced magics as a prodigy of the abbot in the church dedicated. Through plots and intrigue unknown to him at the time, his mentor, an elder, turned up dead one morning when he was 11. He continued his training through the succeeding elder, who taught him the darker sides of life magic, helping him channel his ability to take life, burn and corrupt from within. Though initially opposed, he gave in and trained in ways that undid his earlier lessons under the guise of "advancing his studies further and studying the countermeasures of life-giving magic."
Upon his graduation from the school, he began work as a cleric in the Church of Avacyn, entering the priesthood. He continued his work for his parish until he was 31. He had ascended to eldership for his parish one year earlier due to the high turnover rate (high turnover into food for vampires, werewolves and the undead). One day, he stumbled upon a secret meeting between his second mentor--now the Mayor--and a demon he had a contract with. The Mayor noticed Lanestol and threatened him, though his former student did not back down and challenged the Mayor to a duel, countering with the threat of revealing his dark pact to the town.
The duel ended after half an hour, with Lanestol narrowly besting his former mentor. Foregoing the opportunity to finish his fallen opponent, he instead questioned the Mayor about the death of his first mentor. He had begun to suspect a few things over the years, though without solid proof, he could not accuse him of anything. With his fate in his better's hands, the Mayor revealed he did, indeed, kill Lanestol's first mentor in an attempt to fast-track his way up the clergy ranks. His ultimate goal was to supplant the Lunarch himself. A burning in Lanestol's chest flared up like never before, anger and suppressed grief rising up and unleashing in the awakening of his Spark.
He planeswalked to Kamigawa, suddenly confused as to why he was not facing the fallen Mayor. Or why he did not even know where he was. It did not look like anything he had ever seen before. It was much more lush and the air much fresher than anywhere he had ever been on Innistrad. All he could do was walk and try to find someone. After two hours of wandering through the Jukai Forest, his injuries, drained power and hunger took the last of his energy. He awoke after a nearby kitsune village took him in when two of their sentries discovered him unconscious. An elder among them answered several questions he had about where he had wound up. In return, he used his skills to serve the village until he regained his bearings.
After he had figured out more about his planeswalking power, he finished repaying his dues and left to another plane, to Ravnica. Among the various guilds of the great city-state, he found his place best serving the Orzhov Syndicate, even after discovering their corruption. This time, though he serves a corrupt cause, he hopes to overturn the Syndicate's rot from within. For now, he begrudgingly serves the will of the Ghost Council, using a slow approach to chip away at their grip.
Equipment: A staff which used to bear the sigil of Avacyn and which he uses to channel his power, a necklace with the Orzhov sigil Misc: Visits the Maw of the Obzedat periodically to leech a little life here and there from those who have resigned themselves to repaying their debts by feeding the insatiable beast.
I'm gonna have to bow out before this gets rolling. Too much going on in the near future and I see this looks closer to ready than I foresee being anytime soon.