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Cards that only work against specific colors like Devout Decree and Aether Gust might be tempting with their cheap costs and strong effects, but these are often just too narrow to be consistently effective
Black & WhiteDark Explorers, 110/108) Chip-Chip Ice Axe (Sun & MoonUnbroken Bonds, 165/214) Delinquent (XYBREAKpoint, 98/122, 98a/122, and 98b/122) Duskull (Sun & MoonCosmic Eclipse, 83/236) Flabb (Sun & MoonForbidden Light, 83/131) Forest of Giant Plants (XYAncient Origins, 74/98) Ghetsis (Black & WhitePlasma Freeze, 101/116 and 115/116) Hex Maniac (XYAncient Origins, 75/98 and 75a/98) Island Challenge Amulet (Sun & MoonCosmic Eclipse, 194/236 and 265/236) Jessie & James (Hidden Fates, 58/68 and 68/68) Lt
With the rest of the deck, getting those deserts into the graveyard from the battlefield will be pretty easy, but well get to that soon
All things considered, it's a very low mana investment for how well it synergizes and interacts with the decks that want to include it