Since this cube is no longer focused on emlating Modern format experience, I'm going to try and swap 10 shocks for 10 ABU duals.

Well, let's test it.
Flexible slot: Malicious Affliction/Hymn to Tourach.

A cheaper cost on Karn means it's probably going to be more in demand.

Maybe I'll make a flexible slot: Hostage Taker/Kroxa.

Reveillar for better synergy potential, Lurrus for testing.

Bringing back a small lands subtheme. Shaman must be good both in midrange GBx shell and in multicolor Zoo decks.

I might need a bit more artifact hate. Also Cratermaker is a wider option since any red will be fine having the card at least in their sideboard without him being dead.

For old-school flavor.

Sorry to kick Domri, but he's probably the weakest card in my Gruul Section.

For "oldness"'s sake.

Alright, let's try it out.