Niv-Mizzet infamously combos infinitely with himself, partially thanks to MTG Foundations
This is a card good enough to see play in Pauper, Pioneer, and Legacy, so its safe to say itll play great in Draft or Sealed too
Rose, Cutthroat Raider Reds primary means of card draw these days involves exiling cards to cast, so its got lots of payoffs to enable that: Passionate Archaeologist and Laelia, the Blade Reforged are two excellent examples
But its not just the age of this card which makes it hard to come by, this variant has several other factors that it very rare which Ill detail below: It is the Blue Back version, which is far rarer than the Green Back version which was printed later It also doesnt have the number, which was later included on the top-left of the card PSA doesnt distinguish between the No Number and Numbered variants in their population report, but of the 24 PSA 10s that exist only 2 are known to be No Numbered copies you dont get much rarer than that