The reason I don't run Altar of Dementia in my Mazirek deck is because I already use that as a wincon in my Sidisi, Brood Tyrant deck and I like my decks to do different things. That's honestly the only reason I don't run it. It's an amazing card because it's a free sacrifice outlet that can disrupt opponents.
It's definitely a great card. For 2BG you can hit any nonland permanent at instant speed with no upside for the opponent. Or, if you just need that artifact or enchantment gone, 1G will do the trick. It's essentially a 100% upgraded Naturalize.
Below is the list I'm currently running. I remember reading this primer when Mazirek was printed and it helped me a lot with initial list that later I tailored to my playstyle. My version is mostly control-attrition with a lot of recursion. Control elements (eg Voidwalker, Clique, Helm) serve the purpose to stop any shenanigans opponents might try or use to win and to use opponents cards against them while pressuring them with ever growing creatures. There is quite a lot of combo lines squeezed in with minimal amount of cards to offer some inevitability if the game goes long. It works great because most of the card can serve multiple purposes eg Yawgmoth can be combo piece, removal, overrun, free sac outlet, Hermit can be combo piece, free sacrifice and generates a lot of board presence to put counter on, etc. I intentionally have included minimal amount of tutors but a lot of recursion. I prefer to explore different play lines rather than always end up with the same result. This is also the reason that the whole reanimation suite can hit opponents graveyards. It creates even more unexpected play lines.
Currently I'm testing Defiler of Vigor and due to this I have also added Spike Weaver. I'm not sure how viable those will with only as many green permanents as I have but I can always slowly loop creatures with Stronghold or Witness/Deathmantle while growing my creatures. Defiler should also help with those green heavy creatures. Weaver is in due to increased number of aggro decks in my meta and people not running enough removal.