MTG Salvation

Ramp, ramp, ramp.
We want to put as many lands into play through the course of the game, so that casting Zacama, and having a multitude of activation's at the ready is possible.

With a limited number of ways to get extra lands into play in Brawl, Thaumatic Compass and Treasure Map are perfect for casting Zacama, but do provide value along the way. As a hint you should really always look at the cards that transform into lands in Brawl. Ramping is an important part of casting more powerful spells, which you need to overpower opponents in multiplayer.

BOOM!
Red and white has some of the best mass board removal in standard, so we are looking to utilize this by clearing the board, probably several times during the course of a game. The follow up is of course with Zacama, Primal Calamity to finish off anything relevant.

Utility critters
Ranging Raptors and Ripjaw Raptor are nice mid range creatures that can generate value and block. The great thing is that if you have to use one of your cards like Sweltering Suns, Hour of Devastation, Star of Extinction or Heaven // Earth, that you will get value from them as a consequence.

Glorybringer, might be the best card in Brawl to handle opposing commanders. If opponents are not removing this, then it's almost impossible for them to play out their commander into it's wrath. Look for this card to be quite a dominating feature of Brawl in general. Because Zacama cannot target planewalkers with his ability Glorybringer can help to remove them with the flying and haste, clearing potential flying blockers.

Prowling Serpopard is a key card against counterspell heavy decks, as they often will hold up a counter for Zacama.
It's also worth noting that if you suspect that your opponent are holding up their mana for a counter, then often you can delay casting Zacama, and this punishes them as they fall behind what the rest of the opponents are doing, as they didn't use their mana efficiently. You can actually be patient with this deck, as you have a lot of removal, so often are not under a lot of pressure. I'll often only cast Zacama when I have 11-12 mana available, so that removal while the untap lands is on the stack is pointless, as you can just cast it again. This way you get to use Zacama ability at least 3-4 times.

Embrace the grind
Games are so grindy with all the mass removal of non-lands happening, that sometimes it's the utility lands, especially the transform ones that can cause a problems, as you can clear the board except for these.
Spires of Orazca, Atzal, Cave of Eternity, Arch of Orazca, Azcanta, the Sunken Ruin, Conqueror's Foothold, all cause problems when games go long, and most do.

So to counter this as much as possible, you can use Ramunap Excavator to keep getting Field of Ruin. There are double ups for tutors to get these particular cards.
Uncage the Menagerie can get Ramunap Excavator.
Hour of Promise can get Field of Ruin and also Evolving Wilds, to make Ramunap Excavator better as well.

Uncage the Menagerie can get any three of these: Prowling Serpopard, Ramunap Excavator, Ranging Raptors, Atzocan Seer.
So you have access to a toolbox that can really help long games.

Atzocan Seer is mainly used to get Zacama back from the graveyard, if a lot of removal has occurred, if Zacama tax is beyond what you can afford. You really should hold onto Atzocan Seer in hand, unless you are really in need of extra mana, or possibly desperate to get Ranging Raptors or Ripjaw Raptor back. But don't be tempted to use it like this unless you are under a lot of pressure.

Please use protection kids!
There is some protection for Zacama with Blossoming Defense and Heroic Intervention providing hexproof, which stops removal, especially stealing, where Zacama is of course a popular target. It must be noted that if you're playing against a blue control deck, then you might have to make sure that you have the 9 mana available to do 9 damage to Zacama itself, just in case your opponent is looking to do a steal tactic.