Doubling Season Planeswalkers.

Use Doubling Season to double the amount of loyalty your planeswalkers come in with, use their abilities multiple times with Rings of Brighthearth, make it impossible to mess you up with Sphere of Safety + Enchanted Evening + Sterling Grove

Combos: Rings of Brighthearth and a Planeswalkers activated ability, especially the ultimates of Jace, Architect of Thought, Sorin, Lord of Innistrad , and Sorin Markov. Ral Zarek is in the sideboard for the same reason.

Sterling Grove tutors your enchantments early, and gives them shroud later!

An ultimate from either Garruk, Caller of Beasts or Jace, Architect of Thought can cheat in Progenitus. He can be hardcast in this build though without too much difficulty.

Sideboard in Token-generating planeswalkers and Sarkhan the Mad for some fun Dragon plays.

Enjoy! Suggestions are encouraged and don't forget to upvote!