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As for the other three (Evolution SageEvolution Sage, Metallic MimicMetallic Mimic, and RealmwalkerRealmwalker), while they're creating synergy with the deck, I would have preferred something a little more oceanic, or at least from Ixalan itself, like Roaming ThroneRoaming Throne, for example

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Over time, these Creature-types-matter cards have grown not only in number, but also in power level