They were only available at the Pokemon Centers in Japan for a very limited time and in very limited quantity, in July, 2019
You may not need these, but it makes troubleshooting and/or tweaking the deck later significantly easier
1-for-1 removal can only be so good, and this loses value in metas where players are optimizing towards cheaper, more efficient permanents
Super Large High Capacity: This deck box holds 6100+ double-sleeved cards, 6140+ single-sleeved cards, or 6240+ unsleeved cards (compatible with MTG/PTCG/Yu-Gi-Oh!)
When Lightning finds her sister turning to a crystal for fulfilling her Focus, she too ends up becoming a l'Cie, kickstarting the game's core story
The front side offers the closest thing we've seen to a white Thoughtseize, offering a way for an aggro deck to slow down a sweeper or combo piece from an opponent, and the backside can easily snowball into a victory for a go-wide aggro deck