I have seen a couple people brewing with these cards in Dinosaur decks, which I find pretty interesting. You can activate Tetzimoc, Primal Death
for midgame sweep value, but you can also bring it back to your hand to activate again even after it dies, so long as you can use Atzocan Seer
to pull it from the graveyard. One list I saw was even using as a 4th color for getting draw value out of Cathartic Reunion only to use Liliana, Death's Majesty as another recursion card for things like Gishath, Sun's Avatar and Zacama, Primal Calamity for just crazy endgame.
Idk about the 4 Color thing, but Abzan seems pretty sweet. Here is a sample list