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I need a clarification on the Builder card. It says "Reduce the cost of one building upgrade by 1 resource of any type." What exactly is meant by "one building upgrade". Does this mean the card can only be used one time (on one card) during a round? That wouldn't make it a very useful card (since it costs 4 resources to purchase/activate and isn't worth any points). On the other hand, being able to use it as much as you want during a round makes it extremely (probably too) powerful.