How can I make this work only when the player gets the tag?

[light pulsar]

I'm trying to make a code run once when the player gets the tag, so as soon as the player get the gat it should do the thing

I tried using system.run interval but it was always running

And I want it to run only the moment you get the tag

[thick pagoda]

just use a dynamic property to store if the player had the tag the previous tick