New cards join the game, old cards rotate out
During the End Phase of the turn this Set card in your Spell & Trap Card Zone was destroyed by an opponent's card effect and sent to the Graveyard: Target 1 card your opponent controls (if possible)
A deck that focuses on summoning high Link monsters, particularly with a Firewall Link Monster, would benefit from using Protectcode Talker to provide protection and a revival option
What was described above is common to pretty much any Elite Trainer Box, though, but some of these things change visually depending on the expansion set, so for the Shining Fates Elite Trainer Box, it features Gigantamax Eevee card sleeves, a certain color of dice, etc
As long as Monkey King is face-up on the Field, this card won't be destroyed and your opponent cannot activate another Field spell