They come off as edgy, not to mention using them as archetype names starts creating all sorts of problems with already released cards
Curiously, despite being more expensive, Witch-king, Bringer of Ruin isnt the more synergistic card out of the pair
Sure, demand for rare Pokmon cards may be high right now, but it could easily disappear overnight as young investors and collectors turn to something else
The three mana is definitely awkward, as you won't be able to use it to protect a Violent Outburst as a Force of Negation would, but it does deal with more proactive answers such as Teferi, Time Raveler
My suggestions are: just a little section about what these cards actually are (ie
Give your Pokmon Japanese booster box a simple way to stay protected while on display or in storage