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Any effect that would inflict damage to a player instead increases their Life Points by the same amount

Several players in the r/CompetitiveEDH thread on Yshtola noted these synergies and their potential in the format

Also summoned Marauding Captain in hand, then The Dark - Hex-Sealed Fusion, like a combo that sent Cyber Twin Dragon to his GY along with Special Summoned Cyber Dragon and later Normal Summoned The Light - Hex-Sealed Fusion

The strategy with this card was to combine it with effects such as Dark Hole that can destroy your own monsters, then search out those combo pieces whenever you need it

This set delivers many special illustration rares and powerful trainers