Zde je důvod:
* Crystal Beasts jsou monstra: Their main purpose is to be summoned to the field and attack, defend, or activate their effects. They are not designed to be used as Spell/Trap cards.
* The Spell &Trap Zone is for Spell and Trap cards: As the name suggests, this zone is specifically for Spell and Trap cards, which have their own unique effects and functions.
* "Crystal Beast" is a type, not a specific card: There are many different Crystal Beast monsters, each with their own unique effects and abilities. There are no Crystal Beast cards that are designed to be placed in the Spell &Trap Zone.
However, there are certain cards and strategies that involve moving Crystal Beast monsters to the Spell &Trap Zone:
* Efekt „Crystal Beast Rainbow Dragon“: This powerful monster can send itself to the Spell &Trap Zone to summon other Crystal Beasts from your hand.
* "Crystal Beast Sapphire Pegasus" effect: This monster allows you to remove a Crystal Beast from your Spell &Trap Zone to activate its effect.
* Efekt „Posílení armády“: This card can add a Crystal Beast from your deck to your hand by sending a Crystal Beast from your Spell &Trap Zone to the Graveyard.
Stručně řečeno, Crystal Beasts v Spell &Trap Zone jsou neaktivní a nelze je použít, s výjimkou specifických efektů karet, které jim umožňují dočasně je tam přesunout pro speciální účely.