While we have more than enough actual slivers to choose from, there are a few changeling cards that might be considered: Mutavault, Shields of Velis Vel, Amoeboid Changeling, Blades of Velis Vel, Shapesharer, Mirror Entity, Taurean Mauler, Chameleon Colossus
You also score points for being the last player alive in a game
According to TCGPlayer, the pull rate for special illustration rare cards in Prismatic Evolutions is 1 in every 45 packs
This replaces the traditional method of attaching energy cards directly to Pokmon
Take a look at Blackray Kuubi
Its a really striking design, but the card itself also cleverly implements the fact that Sogeking is really Usopp underneath the fancy garb as well as being able to snipe a character, returning it to the owning players hand