Part of Casting Spells
To cast a magic spell, you must declare all targets of the magic. For example, if you cast Arc Lightning, you must declare the 'target nearby unit' at the moment you cast the magic spell. When the magic goes on the storyline, the target will have been chosen and can't change later when the magic resolves. Note that some magic spells do not use the word 'target' and instead use a word like 'ally.' For example, when you cast Overpower, you do not need to specify which ally you will choose, and instead you simply select the ally when the spell is resolving from the storyline. Finally, there are a few magic spells that don't target directly, and instead cause an ally to target. In that case, you also do not need to specify targets when you cast, since you only need to declare the targets that the magic itself is targeting. For example, if you cast Joust!, you do not need to declare the target when you cast the magic; you select the ally when the magic is resolving from the storyline, and then the ally (not the magic!) does the targeting at that time.