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Honorable Mention: Heliod, Sun-Crowned - it's the best possible mono-white commander in my opinion, even though it will be obvious that the deck will definitely have the game ending Heliod, Sun-Crowned + Walking Ballista or Heliod, Sun-Crowned + Triskelion combo

However, the main thing Ill say is that Amazon is not the place to go for purchasing singles

9 Sigurd, Jarl Of Ravensthorpe For Storytellers Yet another creature type that needs additional love, Warriors will be happy to add Sigurd to their toolkit and might even find him a useful commander in his own right

The only constants are that Addendum spells have to be instants (or have Flash) and that they power up when you eschew this timing advantage