Hibernation Sliver makes all Slivers very difficult to kill as long as you have life points and mana left to play with, and with all your creatures so cheap you would usually have plenty of both when it counted
Their packaging does tout the sleeves as Acid-Free without mentioning what type of plastic they are made of or the PVC content
For example, Elsa Snow Queen was printed back in set 1, The First Chapter
Even if this Digimon is defeated, you can easily use its powerful DNA Digivolve and removal effects again
Ive imported Japanese cards in the past and have gotten a few miscellaneous ones here and there, so Im not unfamiliar with the silver border, but to see the silver borders with English text was quite an experience
This was a huge advantage to Millstone decks, as you could protect yourself or attack your opponent with their own creature