One of the problems in recent history was that there weren’t really good four mana green creatures. Why was that a problem? Because there were plenty of two costing mana elves. If you play those, you want to play a four drop to play on turn three. Sure, there is Bristling Hydra, which is still quite strong, but there’s some new ones in the new set. (Actually, Crocodile of the Crossing is quite underappreciated as well.)
Granted, neither of these is exactly Polukranos, World Eater, but then again, what is?
The manabase is a bit wobbly, but maybe we’ll manage. Coming up with an eight drop worth playing would be nice as well. Nissa sort of handless that role. Maybe Sandwurm Convergence? Finding the three blue for Hour of Eternity might prove challenging, so I might cut that for an extra forest and maybe cut some of the utility deserts for Desert of the Mindful.