Theyre effectively counter-quadruplers, because both the initial replacement effect adding counters and the death trigger are enhanced
It's an open-ended question, but if you can't answer it everything else in the deck won't matter
They don't go away as steps, phases, and turns end, and effects that add mana "of any type" can't give you energy counters
Stolen by the Fae is an X spell and a bounce spell that also gives you a bunch of Faeries
I have yet to see someone open their fifth copy of a rare or mythic, though, so I dont know how much Vault progress those will give you
Most Pokmon cards are graded in accordance with Professional Sports Authenticator (PSA), which is scaled from a 1 for poor and a 10 for Gem Mint