On paper, it looks like your commander will be able to supply all the draw power you could possibly need, so all you have to do is get enough mana to cast him (and the cards he draws) and make sure he resolves. So, I'd look to run as much ramp and fixing as possible to ensure that happens early and often. You might try Mina and Denn, Wildborn to get extra land drops. More will assuredly be revealed through a few Gatherer searches...
Would it be a flavor-fail to include the ten original Signets or some other such cycle? Otherwise your mana is going to be super rough, even with the million-dollar manabase.
EDIT: Maybe the Borderposts would fit better since they hit off a Niv trigger?
One more good one for you would be Rhythm of the Wild.
Yeva (88/92 foils)
Raff
Scarab
Rakdos
Wort ($50 budget, 94/97 foils)
Trostani
EDIT: Maybe the Borderposts would fit better since they hit off a Niv trigger?
Yeva (88/92 foils)
Raff
Scarab
Rakdos
Wort ($50 budget, 94/97 foils)
Trostani
Yeva (88/92 foils)
Raff
Scarab
Rakdos
Wort ($50 budget, 94/97 foils)
Trostani