Sin and Chaos are confirmed, and technically, while Hades isnt a final boss of FF14, he is a Capstone Trial and very important to the overarching story
On TCGPlayer, the current market value for the card is $32.56
On top of that you get a fantastic threat
MtG Final Fantasy COLLECTOR Booster Box [ENGLISH, 12 Packs] MtG Final Fantasy COLLECTOR Booster Box [ENGLISH, 12 Packs] IN STOCK Estimated ship date $2,199.99 NOTIFY ME WHEN AVAILABLE Email address submitted
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More specific to promo cards was the fact that they introduced a whole new audience to the game it was promoting