Here is a combo I came up with for my casual multiplayer game with friends. I built the whole deck to run it as the only Win condition, all or nothing. I pulled it off 4th turn with {Dark Ritual}.
{Reassembling Skeleton} + {Ashnod's Alter} + {Heartstone} + {Bog Initiate}/{Initiates of the Ebon Hand}
Sac Dry Bones to Alter for 2 colorless, filter one through the Initates to Black. Use that one to bring Dry Bones back (cost reduced to B by Heartstone), repeat for infinite colorless mana.
I ended it by filtering 2 more colorless into B and casting {Exsanguinate}. Killed 5 people in one play.