yugioh 5ds crimson dragon card (Card) - MP24-EN097 - Prismatic Secret Rare 3D Bonds Beyond Time Crimson Dragon (card) | Yu-Gi-Oh!

Hexproof is most common in blue, although many white and green cards have it too

Dihada, Binder of Wills is an excellent example of what red, white, and black can do collectively

The least likely possibility is that WotC just doesn't bother printing the other Stones as cards

I guess you can get creative with SpellTables block feature to temporarily obscure the view of the other two players in the pod, figuring out a way for you to not see your own top four while your opponent is making piles is going to be interesting

Basalt Monolith There are plenty of ways to make Basalt Monolith into an infinite mana-producing combo