Please, look at real cards for effects of attacks or Powers, I guess it would have to be:
Electrical Charge
Once during your turn (before you attack) you may attach a (L) energy card from your hand to Rotom. (I'm not sure if there has to be more text, cause I'm not checking a real card ATM :F)
and it has to be "during your next turn"
Fonts are off. I think in-text Energies are too large. I also see some other small mistakes, but it's a decent card overall, nice try)
(What? someone has to criticize, if you say it's great or perfect when it's not, you're not helping AT ALL)