Purgatory Knights

"Alexander" is a series of cards with "Purgatory Knights" in its card name.

List of Sets with Purgatory Knights cards

 * Character Pack 1: Burning Valor
 * Booster Set 4: Darkness Fable

Darkness Dragon World

 * Purgatory Knights, Death Sickle Dragon

Dragon World

 * Purgatory Knights Leader, Demios Sword Dragon

List of Support Cards

 * Purgatory Knights Leader, Demios Sword Dragon