You have to sacrifice four creatures when you cast it, but it turns every one of you swamps into a Tim (or Prodigal Sorcerer)
Ad Nauseam Ad Nauseam | Illustration by Jeremy Jarvis This is scary not just because its a cEDH finisher
My initial thought was that youd put nine of these in just about any creature-heavy deck with black in it, but unfortunately they seem to be much rarer than other uncommons, and even at the end of release weekend, buying nine of these will set you back almost $90
A great aggro card and sometimes a nice support card in the same vein as Bloodghast as well
Honestly, looking at the card alone, it's not a card that can be used extensively, but the parts for life-gain decks themselves are available in the Standard environment, and I think it's possible to adopt it in a form that combines Orzhov sacrifice themes