Many fans think of him as Pokmon's equivalent of the devil
Various cards can add further power to the deck, such as the Goblin Anarchomancer, which makes green and red spells cheaper by one colourless mana, the Mage Slayer, which promises unblockable damage, or the Rhythm of the Wild enchantment, which protects your own creature spells from counterspells
There's also Pitiless Plunderer and Morbid Opportunist here which I thought would hint at a Sacrifice subtheme here but nope, there's 1 sac outlet in the entire deck (Shadow, Mysterious Assassin) and like two or three cards that sacrifice themselves (Priest of Fell Rites) so maybe these are either random "hope for value" inclusions or maybe the remnants of a previous version of the deck that focused more on Sacrifice, who knows
Because Arna is capable of doubling counters, as well as copying auras and equipment, there are numerous interesting directions a deck builder can take
You don't choose a target for Prishe's Wanderings at the time you cast it