A while ago, there was a deck called "Jumbo Praxis" which itself was named after "Big Combrei"
The deck was just a shell for Great Kiln Titan and Novaquake Titan. Lots of fun.
I've been updating that list over the years and have sadly lost the Jumbo-ness of the while thing. Lower cost units and hardly any meme potential.
BUT what we have now is a solid, medium-sized bag of fun.
The best part is that the deck will still work fine without a lot of the legendaries. Zuberi, Alhed, Teacher, Kairos, and Carnasaur, can all be reasonably subbed out. (If you do sub them, try to keep them monofaction)
The power here comes from Rhamba, Sandstorm Titan, and Worldbearer Behemoth and the merchants that give them charge or fetch Grodov's burden.
The market can flex a bit too. Burden is the best card here, but Kairos wins games. Gnash might be great, Supply lines is ok here. Trusty flameblast might have a home.
If you want to flex in rares rather than all those legendaries then look at:
Copper Conduit
Braun
Azrog
Siege Train
Siege Breaker
If the rares here are still too expensive on your shiftstone, comment and I'll suggest some uncommons.
Obliterate is a good 5 cost spell if you'd prefer just the damage.
There is also a different Carnasaur that costs six and has killer (only on itself)