See rule 601, "Casting Spells." 711.5
Protective and Spacious Portable Card Holder: Featuring robust construction and premium materials, the Black Quiver Card Storage Case is compatible with PM TCG cards, ensuring that your decks and card collections, including rare holo cards and essential energy cards, remain well-organized and protected during transport
Can Commanders go to the graveyard or exile
This means that you get your cards whether it dies, is sacrificed (which is also dying, but can sometimes differentiate other triggers), is exiled, or is returned to your hand
The somewhat secret ability that I believe is the most powerful is the +1, which most likely takes the last remaining cards from your opponents hand
This is a big move by both companies, as they establish One Piece Card Game to be one of the biggest one in the market right now