This leads to Red Dragon Archfiend destroying all your opponent's Defense-position monsters (bar Link monsters) after the attack to act as a one-sided board wipe
Unlike a normal BOX, which can be entirely purchased with Gems alone, Selection BOXes have a limited number of Packs which can be purchased using Gems
It doesn't copy whether that artifact is tapped or untapped, whether it has any counters on it, or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on
However, boosters from the likes of Vivid Voltage and Chilling Reign are included to make up the numbers
Equip variants or equip abilities with restrictions, like the "equip legendary creature" ability of Brotherhood Regalia, are still equip abilities, and their costs will be reduced by Bureau Headmaster's last ability
The first thing to look at is the card's design