Here's a thought.... Outer God Yog

[Toffee.]

Outer God Yog
LIGHT / Level 4
[Fiend/Tuner]
If this card is Summoned, you can Special Summon 1 Nug Token(FIRE/Level 2/Pyro/1000 ATK/0 DEF) and 1 Yeb Token(WATER/Level 2/Aqua/0 ATK/1000DEF), and if you do, the Level of this card becomes 2. Then, until the End Phase, you cannot Special Summon monsters for the rest of the turn except Level 4 Synchro Monsters. This effect of "Outer God Yog" can only be activated once per turn. Tokens Summoned by this effect are destroyed during the Opponent's End Phase. If this card is destroyed by your Opponent's card(either by battle or card effect), Special Summon 1 "Elder God Noden" from your Extra Deck.
ATK 1000 / DEF 1000

Basically the idea is a monster that can Summon the other 3.
I mean, it makes sense seeing as how Yog's grandfather is Azathoth.
Also, Yog is basically the "everything" in it's matching lore, hence why it can Summon the others.
'Spawns' make Great Old One. It and Noden make Nyarla. It can also play Noden.

Or at least.... If I got the lore right. I apologize if I didn't.

[newhat]

Overpowered and poorly designed. Instant 1-for-1 Synchro for 6 with no setup, triggers on Normal or Special Summon making it repeatable, and punishes your opponent for trying to stop it. Why does it Summon a Token with 2000 ATK?

[Toffee.]

Overpowered and poorly designed. Instant 1-for-1 Synchro for 6 with no setup, triggers on Normal or Special Summon making it repeatable, and punishes your opponent for trying to stop it. Why does it Summon a Token with 2000 ATK?

I over thought the idea, because I'm an idiot.
Anyway, I slapped on a restriction, made the tokens weaker, and removed the "This is a Fusion Summon" clause.