One Piece OP-17: The World’s Strongest Warriors Release Date, Elbaf Details & Collector Guide One Piece Card Game fans have no shortage of exciting releases to look forward to, but OP-17: The World's Strongest Warriors stands completely apart from the rest. Yes, it introduces powerful new cards inspired by the Four Emperors and the long-awaited Elbaf storyline. However, the biggest storyline isn’t what’s waiting inside the booster packs, it’s what OP-17 represents for the ent