Card text
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Official rulings
2 rulings · in English, source ScryfallIf the chosen creature to exchange is not on the battlefield at resolution, then sacrifice this card.
2004-10-04 · Wizards of the CoastThis ability is targeted, so Protection can prevent targeting if it exists when the ability would be put on the stack. Once the ability is on the stack, adding Protection will not counter the ability but the exchange will not take place since the target is illegal and you sacrifice this card on resolution.
2004-10-04 · Wizards of the CoastAll printings