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This question came up in regionals and i am not sure about it... If my opponent flips up Captured Ark and makes me shuffle an artifact can i negate it? He said i could not. Additionally, is it really true that once you choose to use a card that is discarded to do something u cannot negate it (e.g. Unknown nation, unholy writ, go into captivity, etc..
On the Cap'd Ark, what if the artifact is already shuffled and right after it is shuffled in, you draw/play destruction. Do you get your artifact back?