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Core Colors of Life Gain

During your opponent's next End Phase, banish that target

Pull from Eternity and Riftsweeper both give players the opportunity to bring one card back from Exile

(The mutating spell might need flash.) I'm struggling to see the interaction here - Mutate is a static ability that functions while a spell is on the stack, Backup itself seems to be a triggered ability that functions when the Sledge-Captain ETBs and it adds a couple of abilities that are well understood

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Both Kangaskhan and Tauross attacks cost Energy, making them a flexible option for any type of deck, and Druddigons Rough Skin Ability means you dont necessarily need to fulfill the Energy requirements for its attack for it to deal damage