Wanted to build a modern deck that would compliment my insatiable desire to cram Planeswalkers into all my decks, and here is the finished product!

Here's how it would go in magical christmass land:

Turn 1: Drop either Breeding Pool or City of Brass followed by a Birds of Paradise.

Turn 2: Play Breeding Pool, Stomping Ground or City of Brass followed by a Joraga Treespeaker and get her to level 1.

Turn 3: Play Doubling Season.

Turn 4: Play Jace, Architect of Thought. If I get this far it's practically a win. Thanks to Doubling Season Jace will enter with 8 loyalty counters, meaning that I ult him as soon as he ETBs. I take a card from my opponent's library and from my own library I take a second Architect.

You see where I'm going with this..

After I've ulted my fourth Jace I take something from my opponent's library and Nicol Bolas, Planeswalker from my own who, thanks to our old friend Doubling Season, is on 10 loyalty. Use his ult dealing 7 damage to my opponent, they discard 7 cards and sac 7 permanents with on turn 4 is likely their entire board.

An alternative to Jace would be playing Sarkhan Vol after Doubling season, creating 5 flying 4/4 dragons which doubles to 10.

Another interesting target for Jace would be to pull out Emrakul, the Aeons Torn. Because Jace's ability allows you to cast the creature without paying its mana cost I would get the extra turn effect from Emrakul. He's mostly included incase it seems I'll only have the chance to crack off a single Jace, Architect of Thought, though it's a rare and specific scenario so Emraul will likely be shifted to the side board.

To speed up the process I've added Explore for both card draw and extra land drops, Farseek to get the land I need and good ol' Serum Visions for the card draw and extra draw fixing.