Prince of Death? Dracolich?
By the way, I'm also currently at wishing stage in one game without clear winner - though it was a newby game initially so it may be that we are still not so competent in slaughter as to end game earlier...
The only viable Wishes that I've seen are wishes for Gems or blood slaves and/or commanders to cast game ending spells like Utterdark or Astral Corruption.
Wishing for SCs is just a product of people not knowing how to end the game.