In Standard, the ever popular Golgari Midrange deck is running it, while in Pioneer it's seeing play in Black and Rakdos Midrange
While some Duel Commander decks can get a tad pricey (Ive seen deck prices up to 300 tix), its a very narrow option
The Lord of the Pit required you to sacrifice a creature each turn, which is a significant downside, but Timmies embraced the card, I believe, because the idea of a pit demon that required constant sacrifice was cool enough to override the downside
Beyond just being one of the best new Commander options from Aetherdrift, it looks like Ketramose has real competitive legs too
It could be damage, or it could be an effect that says to "destroy" it
Not only does Stomp give you two damage to use however you see fit, but it also stops damage from being prevented