I don't know maybe u should find out yourself and do it the hard way.
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The Exodia cards can be found in the booster packs Legend of the White Dragon and Dark Beginning 1.
The pieces of Exodia can be obtained in the following booster packs:The Legend of Blue-Eyes White DragonDark Beginning 1GX Ultimate Beginner's Pack 1Dark Legends
The five pieces of Exodia came as Ultra Rare in the Legend of Blue-Eyes booster pack. Konami later released Exodia again in a later pack, but changed the rareness of Exodia's appendexs to common, so that players could attain the pieces more easily (Exodia the Forbidden one [the head] was still released as Ultra Rare).
Exodia the Forbidden One and all of it's parts can be found in the booster deck Legend of the Blue Eyes White Dragon. Exodia himself's code is LOB-124. I cannot garuntee, hoiwever, that the pack you buy shall contain the cards. I just know that these can be found in this pack, and intheir Ultra Rare form.
I'm pretty sure there are 9 cards in a booster pack.