Energy is the only deck customization option that affects gameplay
For example, Applejack lets a player summon their real-life My Little Pony toys as token creatures, while Fluttershy can lock down a creature from attacking or blocking as long as her controlling player is looking directly at the card
Her prior work experience includes the Walt Disney Company
In Pokemon, that can include regular holo, reverse holo, and a bunch of modern shiny variants that no longer fit neatly into the old picture shiny vs background shiny split
The other key player would be Otharri, Suns' Glory, as a card that spits out rebels like nobodys business and provides plenty of power to support Shared Animosity and other payoffs
Whats worse, if a player is running multiple copies of Shaharazd then subgames can be started within subgames, creating Inception-esque layers of games within games