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If using cards like this with Unearth effects cards like Cabal Therapy become immensely valuable
Crossed Souls also arms Duelists with new non-Zefra cards for their Burning Abyss, Madolche, Infernoid, U.A., Yosenju, and other Decks
Other memorable contributions include Medicham V Alt Art from Sword & Shield Evolving Skies and the Charizard VSTAR Special Art Rare that appeared in the English-language Charizard Ultra Premium Collection that Japanese collectors will also get in VSTAR Universe
But I believe Karn, the Great Creator truly breaks the format (in the bad way)