Grave Exchange | Magic: The Gathering
Formats Grave Exchange is Legal in
Official Oracle Text for Grave Exchange
—Eruth of Lambholt
Official Rulings for Grave Exchange
5/1/2012 : If both targets are illegal when Grave Exchange tries to resolve, it will be countered 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.