yugioh 5ds dragunity legion 1st edition structure deck with Mirror Force! : Toys & Games TCGplayer - YuGiOh Structure Deck:

As you can see there I got some pretty amazing value with a Ragavan, Nimble Pilferer, Beta Plateau, Mana Crypt, and The One Ring among others

Officially, it's not legal in Eternal MTG formats - namely Legacy, Vintage, Pauper, and Commander

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This can be used to recur several small utility creatures at once, and this effect can even be used repeatedly through the use of additional mutate creatures

That alone will be enough to get me to buy a couple, but theres an added wrinkle