Legendary Creature - Avatar Horror Scourge of the Throne Flying Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.) Whenever this creature attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures
Pearl Medallion The medallions are a great addition to any mono colored Commander deck, so even with the reprint they will continue to gain value over time
Despite that being eight years ago, Atraxa remains one of, if not the, best legendary creatures in the game
The -3 ability is great for creature removal in Standard, and not so great in formats that don't play on a lot of creatures (Modern, Legacy, and Vintage)
There is even a card that is worth over $100 in Obsidian Flames , for instance