You've also got a few sources of life gain (see Mask of Griselbrand, Basilisk Collar, and Blood Artist), and a few ways to wipe the board if things get out of hand (see Decree of Pain and Blasphemous Act)
In fact, Crackling Doom is so good that I wound up not wanting Heros Downfall, a card that has been in every black midrange deck, at all anymore
All the same rules apply to it.) This means it doesn't count as a card toward meeting the minimum deck size in the format you're playing, but in Constructed formats, it is one of your fifteen sideboard cards
Ezekiel Sims, Spider-Totem
Untap is hardly ever used now, with the last time outside of one-off appearances being in Eventide, so why is it here now
Although, it's 3 life and a mana compared to 4 life