Scion of the Ur-Dragon offers an easy, repeatable way for you to search out dragons from your deck and put them into your graveyard, which is already a good enough ability on its own for fueling your reanimator cards
Erkenbrand, Lord of Westfold Erkenbrand, Lord of Westfold could be an interesting human commander, though I think it suffers a lot from being mono-red
It can serve as a powerful damage spell or an effective board sweep, eliminating multiple minions on the board
It brings the color blue to Angels, for reasons mentioned above, but it combines it with green and white
Its still among the most powerful hosers for artifact decks to this day, particularly in decks like Humans that prefer to use creature cards for utility and disruption