Rules FAQ
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The constant ability sacrifices Oathsworn Wildling automatically and immediately when the condition is met. It cannot be saved from or canceled (apart from blanking it).
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If you set up Oathsworn Wildling "alone", it is sacrificed when the setup step is completed, after you draw back up to 7 cards in hand. You can even set up attachments on it and get them back to hand after setup (assuming they are not terminal).