I encountered this situation today and I found it's nontrivial to me:
suppose you have apothecary, scrying pool, hunting party and coppersmith in play and you opt for a copper strategy. (There are +buy, +2 actions and light trashing available.) What would be the correct order to play the scrying pool, the apothecary, and the hunting party, if you have them all in hand? Suppose your deck contains coppers, potion, some VPs and some other actions.