Cathartic Reunion is going to have serious implications in older formats (discarding Golgari Grave-Troll is pretty filthy), but its also going to be a real Standard player
Artifacts like Hedron Archive, Selesnya Locket (and the other lockets), and Dreamstone Hedron can all draw you more than one card when you activate their abilities and sacrifice them
These abilities basically translate as protection from everything controlled by a player. Originally designed for Commander, True-Name Nemesis was supposed to be a casual card that was simply difficult for one of your opponents to deal with in a Commander game
Obviously it doesnt save you from everything (oh, the infamously tricky regeneration mechanic), but it does do a lot
This is the grail for many players, including Post Malone, who owns a signed artist proof (which is significantly rarer), and its what makes all the lotuses worth mentioning at all