The US Labyrinth of Nightmare was the fifth set out and includes some of the best cards as well as introducing the Ritual Monsters like the ultra rare Masked Beast . Complete set has 105 cards.
If other European First edition sets are anything to go by, then grab the cards you want while they are still around. We rate LON as one of the best sets with Magic Cylinder, United We Stand and Mage Power in there to name just a few. Complete set has 105 cards