When I first built Feldon, it had a Goblin and artifact sub-theme since there are a lot of Goblins that have special abilities, including those that relate to artifacts, and the copy that Feldon makes is an artifact (cards such as Goblin Welder and Goblin Trashmaster, for example)
Competing land like City of Brass and Man Confluence only have their damage-dealing mana fixing abilities, so even paying for a generic cost will hurt with those lands
Graveyard hate isnt quite as common as it should be in Commander, so leaning on your graveyard as a resource is perfectly okay too
This is also an instant kill against anyone foolish enough to play Notion Thief
Uchbenbak, the Great Mistake Uchbenbak, the Great Mistake has an interesting logistical play as your commander
World Shaper World Shaper is a mixed bag despite the incredible Heathhull, the Worldseed