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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

In addition to shipping properly, everyone loves receiving little extras

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

response from LLM

A few have shown up in black, like Enslave, or on gold creatures like Dragonlord Silumgar

Custom card backs can add flair, but they wont match official cards