Oswald Fiddlebender Legendary Creature Gnome Artificer Magical Tinkering , , Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle
Charred Foyer doesn't impact the board immediately and requires you to essentially skip your turn four, but at least its advantages snowballs really well if you can survive the next turns
Karlov didnt create a sustained archetype, but they were able to turn lifegain, an accepted perk stapled onto cards like Oust or Wingmate Roc, into a path to victory in Commander
And how can you not love something that creates Octopi
While it may not be Obsidian Flames' most valuable chase card, Gloom is a massive winner that has surpassed all expectations