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Then you can activate Vivi once during your turn to generate some number of blue and/or red mana equal to Vivi's power, which should help you keep chaining spells together or cast a really big one

It also requires direct contact with other humans, which can be a deal-breaker for people who prefer the comfort of automation instead

Avoid Mind Stealer since he can play with a copy of your own deck (although it's fun to have him cast Contract and then win his anted copy of your own card!) Paladin is also touchy, with Karma and Northern Paladin to work against your black deck even before he starts with his Magical Hack and Sleight shenanigans

Storm comes with the Ceaseless Tempest ability, which causes instant and sorcery spells to gain the Storm keyword whenever Storm deals damage