Correction to the Sand Devil Potions! The aftershock cost analysis is wrong, the below data uses HH Gaming information:
You get .746 oil per energy for the best stage to get tier 1 oils, or 67 energy for 50 oil
You get .138 oil per energy for the best stage to get tier 2 oils, or 362 energy for 50 oil
You get .066 oil per energy for the best stage to get tier 3 oils, or 757 energy for 50 oil
So you will essentially save yourself over 1k energy by getting the tier 3 oil in the artifact enhancement event! Well worth going for in my opinion!