If you use Neo 3 Houndooms dark flame attalc whcih costs one R energy does twenty dmage and makes you discard one R energy, you can take one dark energy from the discard pile.  This combo with the second attack which has a coin flip for each dark energy attached to houndoom and with energy flow. 
After your opponent has removed your dark energies you can use houndoom and trade fire for dark. Then use energy flow and return as much dark energy as you want to your hand.
Questions and comments to: hartwig_bill@hotmail.com

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