If all of the targets are illegal, the ability won't resolve and none of its effects will happen
Different Sultai commanders like Damia, Muldrotha, and Yarok offer unique and valuable abilities, such as drawing extra cards, utilizing the graveyard, and doubling the potency of enter the battlefield triggers
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
He comes down early, is very easy to flip the turn he comes out (thanks to extort) and can immediately start his favored gameplan
(You descended if a permanent card was put into your graveyard from anywhere.) Legendary Artifact The Aetherspark As long as The Aetherspark is attached to a creature, The Aetherspark can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty counters on The Aetherspark." +1: Attach The Aetherspark to up to one target creature you control
And lets give it up for Filth, which will give all of our creatures the ability to swampwalk alongside their Swamp King