The absurd amount of card advantage that Necro offers, essentially allowing you to convert life into cards, makes it one of the strongest card-draw spells that has ever been made
On top of that, you included an Atraxa as an extra card and I actually already run an Atraxa deck
For X and two Black mana, you get a sorcery that makes each opponent lose X life, and you then gain life equal to the amount lost because of the card
Three counterspells, and suddenly you are actively digging toward whatever win condition your deck is built around, all while efficiently stopping your opponents dead in their tracks
The artwork on the cards is gorgeous, making them appealing to collectors, and the foil treatment is noticeable but not overpowering
formerly, Hullbreacher, Opposition Agent, and even the golden oldie, True-Name Nemesis