Name all canonical planeswalkers up until Phyrexia: All will be One. Non-canonical planeswalkers such as D&D characters and Unfinity etc. sets. are excluded.
I was going to do this but nice job! You are missing some like Koth, and more type in's concurrent with their Type lines would be really convenient. I would've used this for my quiz so here it is just in case.
https://scryfall.com/search?as=grid&order=name&q=type%3Aplaneswalker+%28game%3Apaper%29