Rule 707.10e

Some effects copy a spell or ability and specify a new target for the copy. If the spell or ability has more than one target, each of the copy’s targets must be that player or object. If that player or object isn’t a legal target for each instance of the word “target,” the copy isn’t created. In the case where a replacement effect causes the copy to target more than one object, the copy’s controller chooses one of them to be the new target. The chosen target must be a legal target for that spell or ability. Example: Frontline Heroism is an enchantment with the ability “Whenever you cast a spell that targets only a single creature you control, create a 1/1 red Soldier creature token with haste, then copy that spell. The copy targets that token.” Anointed Procession is an enchantment with the ability “If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.” If you control both and cast Moment of Triumph targeting a creature you control, Frontline Heroism’s ability triggers. As that ability resolves, you create two 1/1 red Soldier creature tokens with haste, then copy Moment of Triumph and the copy targets one of those tokens of your choice. The copy doesn’t target both the tokens.