Channel Harm

Channel Harm’s effect is not a redirection effect. If it prevents damage, you may have Channel Harm (not the original source) deal damage to the creature as part of that prevention effect. Channel Harm is the source of the new damage, so the characteristics of the original source (such as its color, or whether it had lifelink or deathtouch) don’t affect the new damage. The new damage is not combat damage, even if the prevented damage was.

If the target creature is an illegal target as Channel Harm tries to resolve, the entire spell doesn’t resolve. No damage will be prevented.

Channel Harm’s only target is the creature it may deal damage to. You choose that target as you cast Channel Harm, not at the time it prevents damage.