Maybe try out Oathsworn Vampire? While it doesn't exactly go along with your token plan, its still a creature to continuously sac. It also pretty decent with Forerunner of the Legion, pumping some vampires while getting other triggers.

This is an awesome take on vampires! I really like what you did here with the bontu, hidden stockpile, and elenda synergies. I think you could potentially get some good ideas from my version of vampires. If I were to pick a few cards from mine that could be good here they would be: Vona's Hunger, Angel of Invention, and maybe one copy of Twilight Prophet main board to have accessible through the forerunner. We had the same idea with the forerunner. Turn 3 twilight prophet with ascend activated!. I am aware that it is insanely unlikely to draw the right cards to fulfill the name but its kinda just to intrigue viewers so they look deeper into the rest of the deck. Id also like to here your feedback on my take of vampires if it is t too much trouble. Thanks!

And Shefet Dunes