I think all the remaining Nekroz cards except 2 can be added in the game as they have acceptable power level... Nekroz of trishula can be a bit debatable but I think
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Yugioh Nekroz Mirror THSF-EN020 THSF-DE020 Secret Rare 1st Ed NM GERMAN | eBay
Nekroz Mirror | Yu-Gi-Oh! Wiki | Fandom
Yugioh Großer Zauberer der Nekroz THSF-DE011 Super Rare kaufen — ReCollectibles
DUPO-DE084 Shurit, Strategie der Nekroz | Comic Planet Shop
Nekroz Shurit Question : r/Yugioh101
YUGIOH NEKROZ VON Clausolas THSF-DE013 segreto raro EUR 1,00 - PicClick IT