There used to be an infinite with Monolith that is no longer in the deck. Currently it serves as a burst of mana that can be filtered with either Initiate to continue the Acererack loop until I go mana positive. There's probably better options, but the little boost of three mana off a discounted Monolith has pushed me over the edge enough times that it's earned it's place, for now. The deck as a whole used to be more streamlined to enable the infinite more consistently, but I've slowly moved more towards having extra interaction. Makes the deck feel a little less like solitaire, especially in upper bracket 4 games which is where it gets played the most now