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And, also as you'd expect, Arena has its own backstory

It can be used at any time during combat, even after combat damage has been dealt

The 7 mana worries me less since black has things like Dark Ritual, Cabal Coffers, and Crypt Ghast in it's arsenal

Also a 2 colorless energy retreat cost is pretty cheap for a powerful stage 2 Pokemon like this one and good thing it doesn't take up too much energy since you'll want to retreat it if you are getting close to feinting since ex cards let your opponent take 2 prize cards once they are knocked out, but feinting shouldn't be too much of a problem with this card because of its high hp and a two type resistance

This ability is particularly important in a five-color Sliver Commander deck, where hitting your mana curve can be difficult since its spread across all five colors