Emperor of Bones' effect isn't once per turn, so if it's exiled a handful of cards you can bring them all back in one big swoop
Dark Gengar sports a powerful ability that makes it difficult for the opponent's Pokmon to wake from sleep, as well as Pull In, which switches an opponent's active Pokmon with one of its benched Pokmon
Most decks in our Standard format have some way to accelerate Energy, like Archeops in Lugia VSTAR decks or Mirage Gate [Lost Origin] in Lost Zone Box decks, which allow Mew ex to shine in almost all viable decks
There are tons of folks who enjoy these cards, and they are classic and iconic
Ungraded singles are straight from pack to sleeve/top-loader
Coming to its offensive prowess, for 2 Energy, Psychic does 30 DMG plus 30 more damage for each Energy attached to the opponents Active mon