Pestilence is an ideal card to play, but its black, so lets play Pyrohemia instead
As such, its no surprise that DMU is simply packed with exciting new cards and commanders
Theres an interesting dynamic to Journey to the Lost City
While this seems a little bit off-theme for a deck that is this aggressive, these Ghostly Prison-like effects do tend to play really well in Commander, as your opponents are often forced to choose between developing their board or attacking you
Standard, Commander, Modern, Pioneer, Timeless, Historic, Vintage, Legacy, and other formats are all made up of different sets with their own rules on which sets are considered legal in that format
Moving on to the Timey Wimey deck, we've got The Ninth Doctor, who gives you an extra upkeep step