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Marchesa, the Black Rose : When I build Marchesa decks, I use plenty of creatures that naturally enter the battlefield with +1/+1 counters, which means that, with Marchesa, the Black Rose on the battlefield, we can feed one to emerge without going down a card

It plays best with cards like Anikthea, Hand of Erebos and Starfield of Nyx that want enchantments in your graveyard

Again, it depends on your environment how deep you go with sideboard cards

Late-game, when everyone is looking to close out the game, then it seems fine

One possibility is to cast Apocalypse, a card that gets rid of everything, including your hand, leaving you only with Barren Glory, but that needs to be done on your upkeep, so there are options like Leyline of Anticipation or Emergence Zone to give these spells flash