Ten years is a great vantage point
Cards like Boneyard Scourge relied too much on synergies that weren't supported enough in cube and timings that were nearly impossible to match perfectly with open mana, even if the front side was reasonable on its face
Theres an argument to be made that Emet-Selch, Unsundered is a bit of a nonbo with what Dimir Murktide is doing as an MTG deck
Solemnity does the same thingwith Kitchen Finks and a sacrifice outlet, we can sacrifice Kitchen Finks an infinite number of times, and since it can't have a -1/-1 counter on it, it just keeps coming back from the graveyard, giving us two life each time we go through the loop
Its simple to game this into giving you more triggers by recurring it with Malakir Rebirth or Raise Dead effects
Combo decks can be fragile, and Narset, Jeskai Waymaster is no exception