give error message for plus cards plus *right

give error message for plus cards plus *right+tag

When someone goes to a plus card +*right, Wagn acts like it's a set card it can deal with, letting people create setting cards, etc.

Similarly, any plus card +*right +[any setting] acts like it will work and should instead give a message explaining what's wrong.

Give a message something like:

foo+bar+*right is not valid set card, because foo+bar is a plus card and the right side of plus cards must be a simple (one-name) card.

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