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If a permanent changes zones before an effect causes it to explore, its last known information is used to determine which object explored and who controlled it.

If multiple permanents are instructed to explore at the same time, the first player in APNAP order who controls (or, in the case of a permanent no longer on the battlefield, last controlled; see rule 701.44c) one or more of those permanents chooses one of them and it explores. Then this process is repeated for each remaining instruction to explore.