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Quote From Firebat

Pain Zoo was a strong performer in week 1 Grand Masters. Week 2 there was more of a split on how to build the deck as well as some players preferring Galakrond Warlock.

I chose this build of Zoo because it had huge success for Tom60229 and I think of him as sort of a Zoo master after his success with the style of deck last year. All throughout the previous seasons of Grand Masters Zoo was an off-meta choice and yet Tom brought it every single week except one, I think, might have been all weeks. So, it is safe to say I trust his judgement on Zoo and recommend giving the deck a go.