This is the actual Exodia!

[Overfrost!]

EXODIA EXTREME!!!

Since someone else made a less op exodia . . .

5 Level 12 monsters
You can also Xyz Summon this card by using 5 "Forbidden One" monsters with different names from your side of the field, hand, Deck, Graveyard, and/or banished cards as the Xyz Materials. Must be Xyz Summoned, and cannot be Special Summoned by other ways. This card's Xyz Summon cannot be negated. This card's effects and their activation cannot be negated. While this card is face-up on the field, negate all other card effects in both players' possession. When this card is Xyz Summoned: You win the Duel. Once per turn, during either player's turn: You can reveal this card in your Extra Deck; this turn, negate the effects of all cards in both players' possession, except "Exodia Extreme, the Ultimate Forbidden One".

Also, in all seriousness, I plan to script this card. B-)

[Darthakin]

If you scratch the "deck" and "grave" and "banished" parts, this card could be realistic. 

[Overfrost!]

If you scratch the "deck" and "grave" and "banished" parts, this card could be realistic. 

Definitely not, as there's still that negating effect from extra deck.

[Darthakin]

Yea, scratch that too. 

[VictorSempra]

So, beside the fact you can't even summon this card.....

1. Xyz has to be done from the field. No questions asked. And if you have all 5 pieces of Exodia in hand/field, you win anyway.

2. What'st eh point of having negation if it immediately wins, cause you can't stop its' summon? Alternate wins are stupid anyway.

 

3. There's no point in having a Once Per Turn effect, since it wins the moment you summon it.