Nobody outside of the upper echelons of WotC has the facts and data to support or refute this claim, though, so in order to support my argument, I'll illustrate with examples from a handful of MTG's game modes
Mosswood Dreadknight Certainly the best Golgari card in the set, could Mosswood Dreadknight bring Green back into Standard
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KIND OF A BIG DEAL You wont believe how wide I grinned when I got this preview
The Cloak drops turn three, equips for two, gives unblockable for your Commander to kill quickly and then targeted removal protection with shroud so it wins and protects in one card
Golgari can brick off the opponent's offense and play enough removal to keep the battlefield empty, but also close the door when needed, unlike Rakdos, where you lose access to giant green creatures