by stevelabny
Not only can Monster Battery work really well if it shows up when you already have a decent amount of energy, and then a few more rounds to take the doubled energy out...BUT it can be a great combo card with other ongoing cards with energy costs. The spend energy to heal card or the spend energy to change a die card.
If you have a filled up Monster Battery you can count on quite a few turns of being able to use those other abilities without having to roll more energy, freeing you up to try for BIG attacks, heals/evolves or points.