The only condition was that they were part of sets that featured Ravnica, including cards from the original Ravnica block, the Return to Ravnica block, and the (unofficial) Guilds of Ravnica block
The token you create with the first ability copies the original characteristics of the token it's copying as stated by the effect that created that token
The top six cards are set aside as prize cards and each time you defeat an opponents Pokmon you claim one of these cards
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I'm inviting so many vampires that I seriously thought about loading up the deck even more, running all the best Rakdos vamps I could get my hands on along with Patriarch's Bidding and some extra tribal stuff
This means that the Doomhive will quickly be able to rack up poison counters on your opponents, either focused on a single one, or spread around so nobodys safe