And how can you not love something that creates Octopi
A good example is Obeka, Splitter of Secondss ability to add extra upkeep steps
While it may not be Obsidian Flames' most valuable chase card, Gloom is a massive winner that has surpassed all expectations
That's already a draw engine in itself, but Tamiyo, Seasoned Scholar pushes it further by nerfing creature attacks and rebuying instants and sorceries from your graveyard
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
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