Dion himself could easily helm a mono-white Knights deck, offering a very flickerable token generation and evasion, with a later game ability to pump the team and even blow up a permanent
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owners control with a -1/-1 counter on it.) Illustrated by Adam Rex Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Phyrexian Vindicator I remember the tricks you could pull with Boros Reckoner
Enchantment removal is very easy in Commander, and sitting with 36 cards in exile that will be completely inaccessible with just a single Disenchant or Reclamation Sage
That's because EDH players love casting spells, and they hate restraining themselves, even if they ought to to avoid giving another player a big advantage
A demonic law firm, with aggressive, tireless solicitors, they're also followers of a doomsday prophecy, believing the city will fail "when the Halo dries up"