The Viper is too slow for more aggressive decks which tend to prefer their card advantage to come with casting or killing the monster rather than the effects of the monster when active in play
This issue is that Flare Destroy will consistently defeat your manual Energy attachment for the turn, leaving you always one Energy behind, even with Exp
Cards like Boromir, Warden of the Tower and Selfless Spirit are incredible in these decks since theyre creatures
Here they are: Keep an eye out at your local game store starting November 24, when From the Vault: Transform hits the shelves, and happy transforming!
It even shuffles, so you could get the other cards if you like
Find abilities in different Pokmon that synergize, like Arrokuda flocking more copies into play for Cramorant to discard for extra damage