Its been just about there ever since The First Chapter, but with other decks becoming more popular ever since, Challengers havent had their time to shine yet
Gahiji, Honored One Here's you next new Commander - a 4/4 Beast costing five (two colorless and one 'naya')
His robes and hair offer a wizard look giving slight David Bowie vibes, as he stands against the dark background
On top of that, Emrakul never had to exist in a format with powerful graveyard hate along the lines of Rest in Peace, Leyline of the Void, or Scavenging Ooze, and the presence of those cards gives opposing decks much more ability to fight back against Emrakul
Bloodghast can get milled, then come back onto the battlefield each time Landfall is triggred (which is easy with fetchlands)