shuffle them into the Deck.
Again, pulling this early on in a match could prevent the opponent from ever setting up
Sacrifice to the Doom Gods doesn't specify where it Special Summons the monster from, but I am going to guess it's from the Extra Deck (it's not close to worth the effort if it's the Deck, since Diablo can't be brought out this way)
However, if your Commander deck is in Chinese Traditional, Italian, Portuguese, Russian, or Spanish, your Collector Booster Sample Pack will be in English
And to the last point, its hard to look at the list of most popular generals of all timecurrently Atraxa, Praetors Voice, Meren of Clan Nel Toth, Breya, Etherium Shaper, Oloro, Ageless Ascetic, and Nekusar, the Mindrazer are the top fiveand not think that Commander products have done some homogenizing of the format