Who are the Planeswalkers in Magic the Gathering

In Magic you play as a Planeswalker. A being so powerful you can travel across planes of existence and summon creatures to battle for you. When reading through many of the different books, novels, and comics you may have stumbled upon many other Planeswalkers and wondered... How many planeswalkers are out there?

Well if you are playing Magic right now, you know all the current Planeswalkers. We have seen at least one for each color and some that are multicolored. Here is a list of the current Planeswalkers and what color they represent.

Jace Beleren- Blue
Tezzeret the Seeker- Blue
Jace, The Mind Sculptor - Blue
Ajani Goldmane - White
Elspeth, Knight Errant - White
Gideon Jura - White
Elspeth Tirel - White
Garruk Wildspeaker - Green
Nissa Revane - Green
Chandra Nalaar - Red
Chandra Ablaze - Red
Koth ot the Hammer - Red
Liliana Vess - Black
Sorin Markov - Black
Ajani Vengeant - Red, White
Venser, the Sojourner - Blue, White
Sarkhan Vol - Red, Green
Sarkhan the Mad - Red, Black
Nicol Bolas - Blue, Black, Red

But, there are many more that have apeared in books, comics, and graphic novels.  So many of these different Planeswalkers appear briefly, but several are referenced over and over again.  These are the more commonly talked about Walkers, some are even cards... just not Planeswalkers... Yet...

Urza
Ravidel
Bo Levar
Commodore Guff
Daria
Freyalise
Kristina of the Woods
Lord Windgrace of Urborg
Taysir
Tevesh Szat

Armada Comic created a number of different comic book runs based on Magic. They introduced new and used many existing Planeswalkers in their stories. They also introduced the concept of Battle Mages and Spell Squires, people that were aspiring to become Planeswalkers. There are way to many to list, but Ravidel is mentioned as both, before becoming a Planeswalker. Here is a list of the Planeswalkers mentioned in the comic books.

Ravi
Serra (Viewed as a goddess, but was aPlaneswalker in love with Feroz)
Feroz
Sandruu (Minataur Planeswalker trained by Feroz, and banished by Taysir)
Taysir (Jealous of Sandruu as he has won the heart of a woman Taysir wanted)
Ravidel
Freyalise
Tevash Szat
Kristina of the Woods
Leshrac
Faralyn
Jamil (killed his brother using Nightmare)
Altair (Was enchanted to not access his ability to Planeswalk, freed his people with the help of Nightmare, the enchantment was broken and he served Nightmare for 10 years)