Zoo is actually a pretty good matchup, even without Auriok. Combo for sure is problematic though not an unwinnable matchup, that’s Tron.

BW tokens is excellent in a Tier1 metagame. However for bigger events it struggles to beat combo decks, and Zoo decks quite often even with Aurioks in the main. Basically you cant get to the top tables consistently enough to actually play your good matchups like infect, jund, affinity ect.

As far as the metagame shares go, I’m surprised Grixis has mostly treaded water (I would have thought that splashy T8 finish in LA would have done something for them), and that Goblins are gone from the Tiered scene altogether. Given their similarity to Gruul Zoo, one would assume that metagame conditions that favor one would also favor the other. Did all of the Goblin pilots switch to the Zoo or something? Another question is the amount of Tier 3 graveyard-based decks (Dredge, Dredgevine, Griselbrand, and Living End) – I’m guessing this means people are remembering to pack their hate? Or is the resurgence of control suppressing them? Last but not least… Elemental Shotgun (aka Kiln Fiend)? In the Tiered ranks? Truly, a brave new world.