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It uses a modified version of the Champion mechanic, requiring you to Behold a Goblin to cast it, which protects a key utility piece by exiling it until the Champion leaves the battlefield

March of the World Ooze (Showcase Fracture Foil) This is a pretty neat, if a bit high-cost, anti-control card that can turn your little mana dorks or tokens into beefy 6/6 creatures

The main reason to keep this card in would be the second ability as this deck isn't a green based one, so you are likely to be out ramped by green opponents