by Patrickspel
What we do is fan the cards with the blue action card on top, to show the money has been used for drawing cards. Technically, you cannot use those cards anymore because you don't have the money, you have spent it for drawing cards !Therefore, the only way to activate a the blue card again is by using a copy card, or activate a played card again by the appropriate office space. But in either way, you need to play more money cards, or spend money from an office and then you also lay the worker flat because this was also money spent!
And note that you cannot copy/ activate the blue card in phase 3 a second time, because they only work in phase 2. You can only copy the green, yellow and grey ones.
Hope this helps you a bit?