To unlock the Tainted version of a character, you need to use either the Red Key or a Cracked Key in a certain spot the final chapter
It would draw you one card and cost you one card, with no net gain in card advantage
Since these are mana and card free after playing them the first time, its really nice
BT13-108 U Option Waltz's End Color Black Cost 6 Card Text 1 [Effect] [Main] Until the end of your opponent's turn, 1 of your Digimon gains "[Opponent's Turn] When this Digimon becomes suspended, delete all of your opponent's Digimon with a play cost less than or equal to this Digimon's" and "[Opponent's Turn] This Digimon isn't affected by your opponent's Option cards." Card Text 2 [Security Effect] [Security] Delete 1 of your opponent's Digimon with the lowest play cost
The Speed Duel GX: Duel Academy Box is an incredible collection of cards
OP-11 is a strong buy for collectors seeking high-ceiling chase cards at an accessible box price, and a strategic pickup for competitive players preparing for the Luffy-dominated meta