While there may be more powerful cards available, The Duke of Demise can be a valuable addition to decks that can capitalize on its unique effects and maintain LP resources effectively
You can grab Succession as a reborn spell, Heart as extra World Chalices in hand, Clash for some attack manipulation, Awakens if you want to run a link that youd want to summon on your opponents turn, Struggle as easily accessible spell/trap removal, Cliffhanger as a really funny way to shift a game in your favor, and Sorrow as a good counter trap
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Ward has already proven to be powerful on a single character
You know, from Metalworker players who want to foil out their Ugins
Im imagining a world where weve built a singleton Mercadian Masques block Constructed deck except for four copies of Cornered Market