If both targets are illegal when Grave Exchange tries to resolve, it won’t resolve and none of its effects will happen. If only one target is legal, the effect relevant to that target will happen and the other will not.
2012-05-01 · Wizards of the Coast
Grave Exchange targets both a creature card in your graveyard and a player. You can’t cast it unless there is a legal target to choose for both. You can target a player who controls no creatures.
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