Possibly bugged interaction with Gwenna, Eye of Gaea and Battery Bearer. Battery Bearer's mana ability overrides Gwenna's, and you cannot tap Gwenna for 2 mana for creature spells. : r/MagicArena
Black Mana Battery · Legends (LEG) #274 · Scryfall Magic The Gathering Search
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Radiant Blue Buff + Manazane + Blue Battery broke my Kai'sa! : r/TeamfightTactics