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Yes. Skytread's combine effect is a 'may', which means you can allow one of your Skytread pieces to KO and opt not to combine. On your turn, you can then bring a the Skytread piece back from the KO area using I Still Function!, and then when the returned character KO's at the end of your turn, you would be able to combine to form Raider Skytread. If all characters were tapped, they would have been untapped before the I Still Function! KO, so you would not be able to attack out with the newly combined Raider Skytread.
