These two cards were clearly meant to be played in the same deck at top level with the idea being to get lots of energy into play quickly using Naganadel's ability "Once during your turn (before your attack), you may attach a basic Energy card from your discard pile to this Pokmon." alongside the Beast Ring, then use Blacephalon to OHKO everything
And oh yeah, if you are playing in a deck with adapt like our Biomancer above, then you can tap use and adapt over and over and over and over again, growing your dorks
A Brief History of Serialized Magic Cards Magic introduced serialized cards with the printing of special mirrored Viscera Seers
For instance, Umbreon ex has an attack costing one Darkness, one Lightning, and one Psychic energy, while its counterpart Espeon attacks with Grass, Psychic, and Darkness energy
It has various currencies to give you a boost when building a collection