I think Harvester is better in a Mono Black deck because black is limited in ways to destroy non-creatures and has many ways to get value out of your own creatures dying, but if you're in, say, black/green and packing lots of green's artifact/enchantment removal, Kothophed could be superior
But the biggest news for us Commander players is a game-changing rule: legendary vehicles and the new legendary spacecrafts can now be your commander
And lets give it up for Filth, which will give all of our creatures the ability to swampwalk alongside their Swamp King
There are some three drop mutants in standard at the moment, and adding 'when this creature dies, draw at least two cards' makes even the worst of them playable
It has vanishing and gets a time counter for each creature phased out this way
If all of the targets are illegal, the ability won't resolve and none of its effects will happen