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What set is Osgood, Operation Double Token from

To stop the transmute youd need a spell like Voidslime that can counter activated abilities, or a spell like Discontinuity that ends the turn while voiding the stack

GX chapter 21: "Enemies on the Move!!" Yu-Gi-Oh

The most likely reasons are if it's sacrificed, if it's legendary and another legendary creature with the same name is controlled by the same player, or if its toughness is 0 or less.

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