The problem has been patched by NeftyBlocks.

These analyses show that the results of the GUILD currency card packs were unevenly distributed.

cleaned_data.csv - table containing draw data with rarities and running totals
analysis.csv - results of hypergeometic probability calculations

Template A = Common, Template B = Rare, Template C = Secret Rare, Template D = Unique

Analysis of pack opens 1-691 (when the final non-common was drawn)

Analysis of pack opens 1-295 (after which only 1 rare remained)