You canâ€™t cast Epic Confrontation unless you choose both a creature you control and a creature you donâ€™t control as targets.
If the creature you control is an illegal target as Epic Confrontation tries to resolve, the creature you control wonâ€™t get +1/+2. If that creature is a legal target but the creature you donâ€™t control isnâ€™t, your creature will still get +1/+2. In both cases, neither creature will deal or be dealt damage.
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