[SPOILER] Considering what we've seen...

So far we've seen a few major tribes showing up. Those are

Vampires, Dinosaurs, Pirates, and Merfolk(and if I'm missing some feel free to remind me) with one Orc card shown so far.

We've also seen two of these tribes connected to their respective 3 color shards. Dinosaurs on Naya and Pirates on Grixis (pls let Ramirez show up). Now looking into the past, we can see that orcs have appeared mainly in red and black, vampires almost exclusively black (some in white) and Merfolk in bant. With alllll this in mind I want to put forth the following

• Jund - Orc
• Bant - Merfolk
• Grixis - Pirate
• Naya - Dinosaur
• Esper - Vampires

These will be the tribes and these will be their colors.

Argue with me, agree, let me know if you might change or if you think this is even viable