Every turn feels impactful as you steadily build toward summoning colossal creatures that can swing the game in your favor
(2022-10-07) While you'll use the cards in your graveyard to determine the stats and abilities of your graveyard-that's-a-creature, those cards aren't themselves on the battlefield
Rounding out the mana rocks, Id like to suggest two that I think will always make the shortlist: Chromatic Lantern, and Thran Dynamo
Sure your consistency is a little off, but this is to decide whether or not certain cards contribute the way you want them to when you do see them
Brago, King Eternal Brago, King Eternal is a mass flicker engine
Many of Black's creatures are undead, and several can be sacrificed to make other creatures more powerful, destroy opponent's creatures or permanents, or other effects