The Mana production was from Burnt Offering, by sacrificing a creature, and Song of the Damned, by adding Black Mana based on the number of creatures in your graveyard, both cost one Black Mana and could be used efficiently to get more Mana from one spell than a Dark Ritual, which was also reprinted in Ice Age
4 - Humility Humility slows games to a miserable crawl
Later in the game, you can have a greater toolbox, with different exiled creatures that can provide card draw, bounce, removal, or just size
Mox is best when you have a lot of coloured non-artifact cards but this is how to make your affinity deck worse as a general rule
One of the most common combos for an Obeka deck is Final Fortune, Isochron Scepter, and Obeka, Brute Chronologist