What Yu-Gi-Oh pack do you get Crystal Beasts in?

The Crystal Beasts were first introduced in the "The Lost Millennium" booster pack. However, their core support cards were spread across several different packs, including:

* "The Lost Millennium" (Crystal Beasts, Crystal Beast Sapphire Pegasus, Crystal Beast Ruby Carbuncle)

* "Pharaoh's Servant" (Crystal Beast Emerald Tortoise, Crystal Beast Amber Mammoth, Crystal Beast Amethyst Cat)

* "Legend of Blue Eyes White Dragon" (Crystal Beast Rainbow Dragon)

* "Cybernetic Revolution" (Crystal Beast Harpie Lady)

While the Crystal Beasts have received further support in other packs, these are the packs that contain the core cards of the archetype.