One could also consider this a weakened version of Exodia. In exchange for becoming playable (A monster card version of himself), you lose his Victory Condition, but the price for having Exodia's Victory Condition is him being unplayable (having the "Forbidden Ones" in your hand).
Another thing to consider is that during each of your End Phases, a "Forbidden One" monster is added to your hand, which means that he becomes more powerful over time. While "Exodia" will lose 1000 ATK in each instance, his Victory Condition becomes possible again.
This card's immunity to card effects is a stronger form of the immunity of "Exodia Necross" to Spell and Trap effects and destruction by battle. While "Exodia Necross" gains power the longer it remains on the field, this card loses power the longer it remains on the field. "Exodia Necross" requires all five "Forbidden One" cards to be in the Graveyard to stay in play; this card returns the pieces from the Graveyard to the hand.
"Exodius the Ultimate Forbidden Lord" gains 1000 ATK for each Normal Monster in the player's Graveyard, and can send a new monster to the Graveyard each turn; this card gains 1000 ATK for each "Forbidden One" monster in the player's Graveyard, and returns one of them to the hand each turn. The effect of "Exodius" allows the player to instantly win the game once it has battled five times to send each "Forbidden One" card to the Graveyard; this card would need five turns to return all five "Forbidden One" cards from the Graveyard to the hand, which would then trigger the instant win effect of "Exodia the Forbidden One". Both cards are also Level 10.
This is one of the few cards to debut in a video game before being released as a physical card.
This is the only "Exodia" card not to have the ankh modified in its TCG artwork.