Combust

If the targeted creature is an illegal target by the time Combust would resolve, Combust won’t resolve for having an illegal target.

Combust can be targeted by spells and abilities that try to counter it (such as Cancel). Those spells and abilities will resolve, but the part of their effect that would counter Combust won’t do anything. Any other effects those spells and abilities have will work as normal.

Spells that create prevention effects affecting the targeted creature can still be cast, and abilities that create prevention effects affecting the targeted creature can still be activated. However, damage prevention shields (including those created before Combust was cast) don’t have any effect on the damage dealt by Combust. If such a prevention effect has an additional effect, the additional effect will still work (if possible).