Regarding the new Planeswalker Rule:
"Starting with this set, all planeswalkers past, present, and future will have the supertype legendary. They will also be subject to the "legend rule." The "planeswalker uniqueness rule" is going away. What does this mean? In short, everything that's true about legendary permanents will now be true about legendary planeswalkers. Also note that this does not mean legendary planeswalkers can be your Commander unless an ability says so."
Quite a few people have been talking about a Planeswalker Stompy deck, now that you can have multiple of a same type Planeswalker around. The most popular Planeswalker in this discussion is Gideon - the reason why is obvious: Gideon of the Trials. You can now have multiple gideons out - creating a solid wall of protection based on the gideon token.
While this rule is not yet in effect (I think), we can start brewing up some sort of gideon deck.
My starting point, initially, in brewing this deck was this modern take (which came out before the rule): here. Now that modern deck . . . is well modern, and is lacking access to a couple of cards that legacy decks have access to. Primarily Sol Lands and Chalice. Running those cards would obviously change the way the deck would be played. I played around with some of the numbers and came up with a rough sketch of a deck, but square_two provided a more complete list here.
Playing some games with that list and i've come to a couple conclusions. (1) We definitely need to run wasteland to prevent opposing Karakas interactions (2) 13 Planeswalkers is unneeded and the modern deck was correct that 10 is probably the more correct number. Then not conclusions, but observations (A) i'm not the biggest fan of the old school Wrath and Armogeddon solutions - I sort of feel in 2017 there must be a better way (B) If we are going to run wasteland, then maybe crucible as well?
Anyway here is a rough list:
Oops, All Gideons!
// 25 Lands
7 Plains
4 Ancient Tomb
4 City of Traitors
4 Wasteland
4 Flagstones of Trokair
2 Karakas
// 18 Artifacts
4 Chalice of the Void
4 Trinisphere
4 Mox Diamond
4 Heart of Kiran
2 Sorcerous Spyglass (new card)
// 7 Other
4 Armageddon
3 Wrath of God
// 10 Planeswalkers
4 Gideon of the Trials
3 Gideon, Ally of Zendikar
3 Gideon Jura