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[berkumps]

Just wondering if the contents of the clear plastic wrapped guild booster packs from the RtR prerelease are fixed or semi-random?

[mystical_tutor]

Just wondering if the contents of the clear plastic wrapped guild booster packs from the RtR prerelease are fixed or semi-random?

Semi-random.

[berkumps]

Just wondering if the contents of the clear plastic wrapped guild booster packs from the RtR prerelease are fixed or semi-random?

Semi-random.

Do you know of a list of the possible contents for each guild?

[NeRo]

http://mythicspoiler.com/azoriusguildpack.html
Other guilds are there as well.

also

This booster, which you should use to build your deck, will only contain cards from your guild or from your guild's colors: eleven commons, three uncommons, a rare, and the foil Prerelease promo for your guild! For that rare slot, there is only one mythic rare you might open: your guild's leader.

This hopefully halps :)