Mummies are explicitly said to massively outnumber the living in the Aetherdrift Guide, so either Amonkhet was like 75% mummy for the Hour of Reckoning (not especially borne out by the story or cards), or they had a very low casualty rate across two invasions
5 Diablo, Devoted Herald (Enchanted) - $154.08 Set Four, Ursula's Return Diablo really had the meta shaken by vanquishing a very popular combo, which could be part of the reason why his enchanted card is selling for a pretty hefty dollar amount
Fate Reforged (2015) brought us Outpost Siege, which served mostly as a sideboard card, but also had combopotential with the second option
A "blocking creature" is one that has been declared as a blocker this combat, or one that was put onto the battlefield blocking this combat
Though youll find the usual Commons, Uncommon and Rare cards in the One Piece Card Game, theres also more that are definitely worth knowing about and understanding