Hey, so this maybe goes nowhere, but... Rats.
If Rats is in the supply, it can gain an unlimited number of Rats. But if Rats is in the Black Market, it can't gain any Rats.
If you have Rats available, you can't have Golem because they combine to make a Village, but trashing Rats with the Doctor overpay gets you whatever cards you want, so you don't have to use Storeroom, so the number of cycles would remain the same.
I think this also allows you to use your Necros for the first 2 cycles and use Crossroads when your handsize is much larger. Not sure if that is better, but maybe it allows something else to be optimized.
PPE: Regarding the Necros in hand, if it is an issue, You can use Margrave instead of Council Room I think.
Edit: I want to credit ghostofmars here because he said basically the same thing, and I only pointed out that we can use Rats if it is sourced from the Black Market. Looking back at the details of his post, it looks like we don't get an extra Black Market play from Tactician, so it isn't looking like an improvement.