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
Essentially its a pay to win game and only in a very tempered group that sticks to formats and limiting budget does the game become reasonably fun
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
In Cube, there has been some talk about this card and some lists are trying it out