Lol. Arceus doesn't need to be completed into 5 pieces, he can wreck exodia while he's chained.
Off topic: A Combo for Exodia:
Set Royal Magical Library. Get it flipped. Next turn, summon Gearfried the iron knight, equip Butterfly dagger Elma on Gearfried, so you put a spell counter on Royal Magical Library, but then Butterfly Dagger Elma gets destroyed and goes back into your hand, you can play it again, and get another spell counter, this chain goes infinitely, allowing you to draw as many as cards as you need.