Lathril, Blade of the Elves Many players' first elf commander is still the most popular by far
This should be a useful bit of functionality to not only deal with those problem pieces you need to get rid of that the other player refuses to quest or challenge with, but also gives you a bit of head room on your characters strength to deal with the growing problem of the Resist keyword blocking chunks of your damage

There are a huge number of cards that could be functionally reprinted with it: Abzan Charm , Ambition's Cost / Ancient Craving , Asylum Visitor , Baleful Force , Bloodgift Demon , Caress of Phyrexia , Champion of Dusk , Corpse Augur , Cryptbreaker , Curse of Vengeance , Damnable Pact , Dark Prophecy , Dusk Legion Zealot , Glint-Sleeve Siphoner , Graveborn Muse , Harrowing Journey , Hoarder's Greed , Kothophed , Liliana's Contract , Live Fast , Malakir Soothsayer , Metalspinner's Puzzleknot , Midnight Entourage , Mindblade Render , Minion's Murmurs , Moriok Replica , Night's Whisper , Ob Nixilis Reignited , Painful Lesson , Parting Thoughts , Phyrexian Arena , Phyrexian Gargantua , Phyrexian Rager, Promise of Power , Read the Bones , Sanguimancy , Seizan, Perverter of Truth , Sign in Blood , Skeletal Scrying , Succumb to Temptation , Toil , Vulturous Aven , and Wretched Confluence

Best Instant Payoffs If you're packing a bunch of instants, youll want something that either rewards you for playing on your opponents turns, ways to utilize your mana (mana sinks), or cards that trigger whenever you cast an instant spell