Double Energy

Double energy is a bit of a gamble. Sometimes its effect is completely negligible, as you do not have the cards to spend the energy generated. On the other hand, it can be extremely powerful, especially as you generate more energy through relics towards the end of the game. This card pairs particularly well with X-cost cards since you can guarantee that all of the energy that you create will be spent. Since it is a hit and miss card, I recommend pairing it with seek to ensure it is pulled on the right turn. The biggest combo for this card is playing double energy then another double energy then playing an X cost card such as storm.