A simple Dark Ritual will make you 2 extra black mana normally, but you can Harness the one in your yard to give you two more
Another direction we could go with Mindwrack Demon is something a bit more aggressive, less ramp-y: Creatures (22) 1 Den Protector 4 Mindwrack Demon 4 Deathcap Cultivator 4 Obsessive Skinner 1 The Gitrog Monster 4 Inexorable Blob 4 Moldgraf Scavenger Lands (23) Spells (15) This list is really more of a Dredgevine deck, shoving all-in on delirium and getting extra value for having it early and often
21 Sek'Kuar, Deathkeeper Turn Your Sacrifices Into Legions A highly underrated aristocrats commander, Sek'kuar, Deathkeeper can provide additional value to the deaths of your creatures
If you've completed a dungeon, you may play that card this turn without paying its mana cost
It gives you enough packs, balanced Limited gameplay, and a better per-pack setup than buying loose boosters one at a time
Magic design should always use the tools in our toolbox when making new sets, but it's okay to make new tools as we need them