As for repeatability and reliability, Scheme and Scrying Pool are enough in a deck with only Actions. With 9 King's Courts I can King 17 Action cards, 9 of which should be Squires (for +2 Buys), 8 more should be Band of Misfits as Squire (for +2 Buys). I have one more Band of Misfits, and a Sir Martin, each of which is worth 2 buys, but I can play them with Throne Room and Procession. Then I play as many more +buy cards as I can fit in the rest of the kingdom (and Black Market), then 10 Goons, and then I buy as many Coppers as I have buys, revealing Trader to gain Silver instead (and the Silver pile is empty).
I only need one of each of Scheme, Scrying Pool, and Trader, so those can come from the Black Market deck (which also contains Young Witch, with Squire as the bane). The ten other kingdom cards can be KC, Goons, Band of Misfits, City (level 2), Market Square, Market, Worker's Village, Hamlet, Festival, and Black Market, each of which gives a buy (including Black Market!).
Candlestick Maker, Pawn, Grand Market, Forager (trashing Fortress) are more +buy, and with enough villages in the kingdom (never mind the Black Market), I can still play one each of Woodcutter, Council Room, Bridge, Salvager and Trade Route (trashing Fortress), Wharf, Herbalist, Horse Traders, Princess, Nomad Camp, Margrave, Storeroom, and Merchant Guild. Rogue can get the Processioned Sir Martin back. There can also be 9 Ruined Markets (possible because the Ruins are dealt randomly from all 50 shuffled).
One more trick: because of the Black Market buys, I can play Counterfeit-Contraband, buy Mandarin from the Black Market (revealing Trader, of course, to leave the Mandarin there), placing Counterfeit on my deck. Then I play Graverobber to get Contraband back, Courtyard draws both and puts Contraband back on my deck. The next 8 Black Market buys, I can play Counterfeit again each time, topdecking it by buying Mandarin, then drawing it with one of the kingdom cantrips. Finally I play Counterfeit again in my real buy phase, using the Herbalist to topdeck it at the end. The top two cards of my deck are now Counterfeit and Contraband, so I will draw them during the cleanup phase, and they won't interfere with my Scrying Pool. This gets me two Contraband plays and 10 Counterfeit plays, for 12 more buys.
In total we have 1 Buy to start with, 17*2*3 = 102 from the Kinged Squires/BoMs, 8 from Throned/Processioned BoM/Sir Martin, 10 from Goons, 7*9 = 63 from other kingdom +buy cards, 17 from +buy cards in the Black Market, and 9 from Ruined Markets. 1 + 102 + 8 + 10 + 63 + 17 + 9 + 12 = 222 Buys, each of which is worth 10 points due to Goons, making 2220VP. We can also play one Monument and one Bishop (trashing Fortress) for a further 4VP. Therefore we can reliably, repeatably and indefinitely make 2224VP per turn.
edit: can't Graverob Silver and then Ambassador it back to the supply after my buy phase, so I do have to leave one KC in the supply.
Forgot to actually put Black Market in the kingdom!