Q: Can the spell "Kor Chant," which redirects damage to another target, be used to direct the damage to a target that might not otherwise have been legal? For example, could the damage inflicted on a goblin by a bear be redirected to a Shadow creature, like a Soltari?

A: Yes. The redirected damage can go to any creature in play that could be targeted by a spell of that color). In the example given, yes, the damage from the bear could be redirected to a Soltari creature.