Cards on the field, hand, Main Deck, and Extra Deck can all be destroyed by card effects
[328] Director Shigeru Ohmori stated that they designed the games based on what they believed of the biggest Pokmon theme of becoming/being "the greatest or strongest", which was expressed in the games' Dynamax / Gigantamax Pokmon core mechanic and the games' increasingly powerful software and hardware capabilities
Once its transformed into Braska's Final Aeon, it becomes a certifiable bomb that provides a ton of free advantage if left alone
One of the big factors is rarity
Code of the Duelist Special Edition is a great way to power up your current Deck, or build a whole new Deck, for less than it would cost to buy 3 individual booster packs
You can't choose more than four targets and deal 0 damage to some of them