No, barrel behind the door only switches effect damage, since wall of revealing light is paying a cost it is not damage and you can not chain barrel behind the door to it.
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No its limited
yes it can unless there is a card that limits it from attacking such as swords of revealing light or messenger of peace.
a thing of light
In the light house you see a blue penguin. talk to him and ask him for a barrel. It's useless unless you want to blow something up.
Yes he can. Just 'sonic boost' after touching the first ring in a chain of rings... Hope this helps!