If I wanted to do this, Id start with a vanilla that could end the game via commander damage, so 3-Hit Club members like Yargle, Glutton of Urborg, Terrian, World Tyrant, or Kalakscion, Hunger Tyrant
Firstly, it sends unplayed exiled cards to the yard, which will undoubtedly include some lands
Its not unreasonable to think you might just draw twenty cards, right there, and if your deck contains a very unusual amount of mana, you might not be far from drawing your whole deck (especially if youve got a couple of Dakmor Salvages somewhere in the mix, making it completely deterministic that you mill your deck, fill the battlefield, and set up some graveyard kill)
Keeping an eye on Best Buy listings for the game may therefore be a good idea in the coming months
Because it has persist, it comes back to the battlefield with a -1/-1 counter