Viagrasaurusrex

I think what he is getting at is if they have nothing to do it means they have no other play/dead turn so why not mess with your gameplan with their open mana.
I agree with Puschkin.

Creatures are what you need to combo off, I have more creatures than him in the build i just threw together:
http://www.mtgvault.com/viagrasaurusrex/decks/marchesa-combo-edh/

I took out most of the creatures that can't combo off or have an immediate effect on the game

I feel its good to have multiple free sac outlets, please remember that if you have Marchesa in play with a single undying creature plus Goblin Bombardment thats infinite damage to everthing I would not take this out, not even a question.
Goblin Bombardment
Phyrexian Altar
Ashnod's Altar
are all great in a deck like this, I prefer Phyrexian altar as it gives colour fixing on the infinite mana

Sphere decks won't be untouchable unless they have leyline out as he can just burn them to the dome for infinite in a few different ways.

Besides that I agree with all your points.

Well you can add more tutors in to help you find the cards you need is always good.
for the most part its spot on like it isn't bad having those unleash creatures etc, they all have synergy and a dropped fairly early. I would recommend slamming in the whip and alter though as they are really good for the deck.

Also darksteel ingot is just better than Obelisk of Grixis

To fit Whip of Erebos and Phyrexian Altar in I would take out:
Carnival Hellsteed
Dead Reveler or Rakdos Cackler

for being new to deck building you did a really good job at building it and finding synergy.

yeah, I agree with most of those choices.
I honestly don't like mogis is just slow(Even for control decks)
I like sign in blood better for midrange, I prefer read the bones in control and it gets you 4 cards deeper rather than two. The scry helps set up your later turns or filter lands so i feel its just better.
I mean any deck that is made fro post rotation has to be taken with a grain of salt as once khans get spoiled a lot will change.

How do you win? and 18 land with that curve?

Not every creature has to have undying or an ability that puts counters on them, you have to remember she puts counters on them along with a few of your other creatures. You should still have a few creatures with some epic ETB abilities.
Also you have a few sacrifice outlets, Whip of Erebos is just amazing with these card. You can bring them from the yard, have them attack get a counter, sac them and then bring them back to play with Marchesa's ability or undying from Mikaeus or just repeat it each turn as you won't have to exile them if they're in the GY(or if they die and come back from an ability as they count as a different card then the one that was whipped into play).

Also phyrexian altar with Marchesa and any creature with undying in play = inifinte mana.

mogis is kinda bad(1 of two cards i disagree with)
Spellheart chimera just gets killed too easy. The best creature for control post rotation is prognostic sphinx. It protects itself and digs for more things to help keep you ahead, its slower but works like a charm.
Besides that you have 0 card draw besides Keranos, I would probably turn those mogic into something like read the bones or divination.

I feel thats the smart choice, helps you power out dude also and earlier kruphix

I really like this deck

How's it going dude?

Raven's crime is an allstar in discard decks. in mono black you can also run dakmor salvage in tandem(2of) with it so you can soft lock them.

See I agree with this in most cases if i was playing R in the deck, but most of the time when you get people down to 1 card they either have an instant that they cast in response to you discard spell, or they just play whatever they have trying to out race you.
Affliction is much better in this version of the deck because you can empty their hand with crime over and over and keep them in the 3 damage range.

Caress would be much better in a different build, but I agree it is a good card.

^pain seer will kill you fast than it will help you.

Besides that mana dorks would still be a great include as you have a high curve and they speed up the prophet

My biggest accomplisment artifact-wise was drafting a deck in scars of mirrodin that had 17 golem foundries and proliferate spells haha.
Robot decks always make me happy:P

If you have cloudstone curio and two 0 cmc artifacts you can infinite proc golem foundry and any other thing that procs off creatures or artifacts entering the battlefield

I will make a curio combo deck :O

breaking // entering?
it mills one more than mind sculpt

Used to be standard? so are you trying to make this modern viable? how is your combo match up?

Yeah I recently found out after commenting on someones thing they are 20$ I thought they were closer to 7$ I remember when they were a 0.50 cent uncommon.

It really just speeds up the deck and makes it so your stuff isn't all getting countered.
plus you can leave mana up for your own counters.

Aethervail in place of departure?:P its cool if you dont wanna spend that money though.

waste not in place of ordeal.
get rid of Tutor and -2 duress for 4x throughtseize?
thats it really seems good.