This deck is pure table flipping :D I love it.
I would not play *any* vanilla beaters in this deck; and
Sun Titan is overcosted without fetch ramp as an out.
Overall really like where you're going.
One really subtle but cool interaction with
Rocco, Cabaretti Caterer is that he can find
Strict Proctor which makes
Selesnya Sanctuary type cards really good. And in three colors you can afford a lot of those and they create some more virtual CA. Proctor is also...very good.
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One thing I will say about hate bears is that the strongest hate bear in EDH is
Archon of Emeria and I would build any hatebear deck around beating that, so the one package I would swap out instantly personally is anything with ETBs. As enticing as the
Recruiter of the Guard →
Kiki-Jiki, Mirror Breaker -->
Dockside Extortionist /
Combat Celebrant loops are with Rocco I think you're right to steer clear of that. But I think you could steer harder.
Try
Serra's Emissary as a wincon! it's on theme and brutal (and doesn't suffer from any hate effects).
So for me that means all the purphoros guys go and get replaced with more hate guys.
Elesh Norn, Mother of Machines can also go.
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I really like
Archon of Valor's Reach. I'd play that.
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Ways to turn bros into mana might be worth thinking about;
Cryptolith Rite /
Earthcraft //
Song of Freyalise. I particularly like Song since the pump is a decent finisher.
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These types of decks often benefit disproportionately from antiwipe tech so I'd consider adding
Akroma's Will and
Guardian of Faith.
If you can think of any efficient ways to give Rocco flash, that would be probably really useful :D