Although the Pokmon boosters boxes are random, each edition still has its hierarchy and best and worst Pokmon
From there, buff them with various artifacts and spells and create a cascading effect to take down that 40-person raid boss (or your friends).
Again - this isn't game-breaking but if you ever need that extra help to go wide, double Eminence might be worth it, especially if you're responding to someone trying to remove Edgar to keep you from blowing up in the first place
I no longer have the unlimited Machamp, but I do have an upgraded mint sealed shadowless one lol Oddly enough, I recall seeing the triangle error packs for sale once upon a time and not wanting them because they looked weird
It is a card that has almost as much value in the graveyard as in your hand and enhances the effect of other cards in your deck like Fact or Fiction while de-powering some offensive disruption from your opponent such as a Blightning
However, by investing in top-quality Japanese pokemon booster boxes, you have a chance to find rare cards without the premium of secondhand prices