Here's why:
* Swords of Revealing Light is a Continuous Trap Card.
* Continuous Trap Cards have a persistent effect that lasts for as long as they are on the field. They do not have an activation effect.
* Activation effects are special abilities or actions that require a player to activate them, often with certain conditions or costs.
Since Swords of Revealing Light is a continuous trap, it doesn't have an activation effect that you can use. Its effect is constantly active, preventing monsters from attacking and changing their battle positions.
It's important to note that other cards can interact with Swords of Revealing Light and its effects, even if the card itself does not have an activation effect.