Since it was its own sheet, if you got a rare or mythic rare double-faced card, you'd also get a rare or mythic rare single-faced card in the booster
A copy did show up for sale in 2017 in Paris at Magic Bazar for $50,000, but the webpages about the posting have been closed and whether or not it was bought is unknown
However, this can quickly spiral out of control if you dont plan for it
So you can potentially see unhealthy combos like that arising again with things like Shiftry (NXD 72/99) from Next Destinies, or Vileplume from Ancient Origins, or Exeggutor (PLF 5/116) from Plasma Freeze, which are all just incredible Grass-type Pokemon that are held back by the fact that they're Stage 1 or Stage 2, which is a good way to cripple a card -- or to balance a card, I should say -- to give it a really strong ability, but you make it a Stage 1 or Stage 2, and it's slower
I was like three years into working at Eastern Michigan Univ and 28 years old