Hey, this list and megamatt's inspired me to build my own marchesa list a while back and I've finally got around to putting it up here at Marchesa's spiky pillow fort. Feel free to take a look. A couple of notable inclusions that have worked really well for me are Settle the Wreckage which is a sunforger-able wrath, and Revel in Riches, which provides inevitability if left unchecked, it might put too big of a target on your back however.

Thanks for your feedback on Price of Progress. I will give it a try and let you know how it turns out.

I like your recent changes and I'm curious how Wound Reflection works out for you. I'm considering trying it. I see how it could act as a second Gisela.

Only change I'd ask you to reconsider is Twilight Prophet. She is working great in my build. The life drain doesn't seem to be harsh enough for people to target her. However she slowly ticks people down in life total for the final sneaky kill. Love her!

Love this deck and all the work you do :)

Yeah, Twilight Prophet is waiting to see what happens. I think I need to go through and reassess all elements in the deck, just to make sure I am not taking things for granted. Mostly, I wanted to try out both card draw lands I put in, as well as the possibility of an extra land for bolstering the mana base. If I find that the extra land is not necessary or that one or the other land doesn't work as well for card draw, it the Prophet will probably go back in. These spots are flex spots on purpose. They allow me to try some things before settling on taking the deck in new directions. Twilight Prophet still looks like a strong inclusion, but I needed the room to try so stuff out. If it turns out the extra land is not necessary, the Prophet goes back in, likely in place of a Mountain.

What are people's thoughts on Mercadia's Downfall? I feel like it is similar enough to a few cards in here that it should at least be considered.

Also considering the merits of Righteous Aura. Anyone want to comment?

Maybe considering Praetor's Grasp for a Wishboard card. Combo hate and tutor for things I can't play in my deck. With a Chromatic Lantern or another rainbow mana producer out, I can steal removal, counterspells, card draw, a wincon, whatever. Also, don't discount the ability to neuter a combo.

@precociousapprentice, I like Praetor's Grasp, but it's also a great way to make enemies! Also, each suggested card requires, first of all, a candidate for removal. So even if a card is good in theory, we need to look at it while comparing to another card we're going to remove from the existing list. So what would you replace with it?

Righteous Aura seems to be better than Sun Droplet in quite a few situations, but the biggest downside is that it needs mana. I'm not entirely sure on this one, since I haven't had enough games with the deck to make a judgement call on it.

And regarding Mercadia's Downfall, I think you've got enough of those cards that win the game on their own, plus I've seen a lot of competitive lists running 80% basics, against which this won't be a threat. Furthermore, if we look at it from the political point of view, unlike something such as Duelist's Heritage you will have to reveal your plans in order to make use of it, as most players won't make a finishing move (such as attacking with all their creatures) without being sure they are going for a kill anyways. However, it might be fine as a card for personal use only in some match-ups, but again, what are you going to cut for it?

I built a version of this deck a few months ago and have been playing it regularly. It's probably my favourite EDH deck at the moment and I love the philosophy behind it. I've won a few times with it, but usually find myself in 2nd place, because I often have difficulty finishing off the last opponent. At that point I often have something like Anathemancer or Price of Progress in my hand, but they aren't usually enough to do the job. I've found Threaten type effects to be far more successful. Also, my meta doesn't allow sideboards/wishboards in Commander so having a toolkit of cards outside the game isn't an option.

Any advice on maximising the (late game) impact of the deck without the benefit of an additional sideboard?

Timotheos, can you tell me more about these losses? Can you give a game report? What was the board state when you weren't able to pull out the win? How was the person who won able to be in a position to not lose? How did the other players lose, leaving you with an opponent that you weren't able to take out? Can you help me to understand a little more so I can potentially give you the best advice?