Natsume/Enma Partner Kamigawa Custom EDH (EDH / Commander)

Helmed by two partner custom commanders: Natsume, Shrine Tender and Enma, Shrine's Shadow (they started out as Shrine commanders but were later shifted to Arcane centric commanders, but I kept the Shrine flavor).

Natsume, Shrine Tender (2/W W/U U) - Legendary Spirit Monk (0/2)
Splicing onto Arcane costs WUBR less (reducing only the colored mana of the splicing process).
Whenever you cast your first Arcane spell each turn, draw a card. If you Spliced onto Arcane, you may instead return an Arcane card from your graveyard to your hand.
Discard an Arcane card: Natsume, Shrine Tender phases out.

Enma, Shrine's Shadow (3/U U/B B) - Legendary Samurai Spirit (1/2)
Bushido 3, soulshift 2, vanishing 1, haste (Enma will always sacrifice itself upon your upkeep, except if someone proliferates your vanishing counters).
Whenever Enma, Shrine’s Shadow dies, create a 1/2 colorless Spirit enchantment creature token named Thousand Doors.
Whenever you cast an Arcane spell, you may return Enma from your graveyard to the battlefield.

The whole deck's purpose is to make an Arcane spellslinger deck. The deck is not very fast, but can do a lot in a turn, even though you will mainly be rewarded if you play one arcane spell each turn.
The main goal of the deck is to always have answers AND be able to draw your whole deck with Sea Gate Restoration active (or any other way of having no maximum handsize) and finishing the game with disgusting arcane spells like Choice of Damnations or Ire of kaminari (before Ire of Kaminari resolves, you can discard all arcane spells from your hand to Natsume's fade-out ability to ramp up the damage).

Despite the tutors and many answers, this deck might be very weak in practise. Didn't have a lot of occasions to test him out.