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Every booster pack of Mirrodin Beseiged has 5 Phyrexian commons and 5 Mirran commons in it. There is at least 1 Phyrexian uncommon or rare, and at least one Mirran uncommon or rare in every pack. In other words, there cannot be a pack where all the uncommons and the rare belong to the same faction.

Here is a small gallery of images posted

A compilation of the booster spoiled cards from MTGS.

Also released were the following images: