Okay, with Dark Ages, we can actually end the game, getting 18 Colonies and 5 Provinces. I mainly just replaced Throne Room with Procession, and did some more Jester trickery. I suspect it's possible to do much better still.
Edit: I had an error where I didn't gain cards that I could've, at the end, on Processions. An error which gave me 3 more buys and thus 3 more Provinces... Fixed everything now.
Kingdom: Watchtower, Masquerade, Bridge, Procession, Noble Brigand, Tribute, Jester, Outpost, Council Room, Border Village
P1: Buys Noble Brigand. (Everyone reveals Estate/Copper.)
P2: Buys Masquerade. Drawing Masquerade, 4 Coppers
P3: Buys Masquerade. Drawing Masquerade, 4 Coppers
P4: Buys Tribute. Drawing Tribute, 2 Estates, 2 Coppers
P5: Buys Watchtower. Drawing Watchtower, 4 Coppers
P6: Buys Jester. Drawing Jester, 2 Estates, 2 Coppers
P1: Buys Watchtower.
P2: Plays Masquerade. P1 passes Copper, P2 passes Copper, P3 passes Copper, P4 passes Tribute, P5 passes Watchtower, P6 passes Estate. Draws 2 Coppers, buying Border Village, gaining Bridge.
P3: Plays Masquerade. P1 passes Copper, P2 passes Copper, P3 passes Copper, P4 passes Estate, P5 passes Tribute, P6 passes Estate. Draws 2 Coppers, buying Border Village, gaining Outpost.
P4: Buys Noble Brigand (To reduce P5's deck to 4 cards. P1 and P2 reveal Estate/Estate, gaining Copper. All other players reveal Estate/Copper).
P5: Buys Procession.
P6:
Plays Tribute, revealing Noble Brigand and Watchtower.
Plays Jester. Gain P2's Border Village, gaining Council Room, P3's Border Village, gaining Jester, and P5's Procession, top-decking all. Let P1 gain a Copper.
Play Watchtower to draw Procession, Jester, Border Village, Council Room.
Play Border Village, drawing Border Village. Play Border Village, drawing Copper.
Play Jester. Gain P2's Bridge, P3's Outpost, P4's Copper, P5's Copper. Let P1 gain a Copper.
Play Procession on Council Room, drawing 6 Coppers, Bridge, and Outpost. Trash the Council Room, gaining Border Village, Council Room.
Play Outpost and Bridge.
Play 9 Coppers.
With 9 Coppers, 2 Jesters, and 1 Bridge, we can buy Procession, Procession, Procession, Border Village (gaining Council Room).
On the outpost turn:
Draw Estate, Border Village, Border Village.
Play the Border Villages, drawing 2 Council Rooms.
Play Council Room, drawing Tribute, Jester, Jester, Watchtower
Play Tribute, hitting Noble Brigand and Estate. (This is possible, as we have cycled P1's deck enough with Tribute, Jester, and Council Room.) Draw 2 Border Villages.
Play Council Room, drawing 4 Processions (P5 draws their Procession, having cycled enough).
Play Jester, gaining P1's Watchtower, P2 and P3's Border Villages, gaining Processions, top-decking both (all having cycled enough). Gain 2 Copper without topdecking.
Play 2 Border Villages, drawing Border Village and Procession. Play Border Village, drawing Border Village. Play Border Village, drawing Procession.
Play Jester, gaining P2's Bridge and P3's Masquerade, top-decking both. P1 gains a Copper. Gain 2 Copper without topdecking.
Play Procession on Procession
- 1st Procession plays Procession
-- 1st Procession plays Procession
--- 1st Procession plays Procession
---- 1st Procession plays Procession
----- 1st Procession plays Watchtower, drawing Masquerade, 2 Bridges, Watchtower, and a Copper. Trash the Watchtower, gain Procession on deck.
----- 2nd Procession plays Bridge. Trash the Bridge, gain Council Room on deck.
----- Trash the Procession, gain Council Room on deck.
---- 2nd Procession plays Masquerade.
----- 1st Masquerade draws 2 Council Rooms, passes Estate and receives Procession.
----- 2nd Masquerade draws Procession and Copper, passes Copper and receives Copper.
----- Trash the Masquerade, gain a Procession on top.
---- Trash the Procession, gain a Jester on top.
--- 2nd Procession plays a Bridge. Trash the Bridge, gain Jester on deck.
--- Trash the Procession, gain Jester on deck.
-- 2nd Procession plays a Council Room, drawing 3 Jesters, Procession, and 4 Coppers. Trash the Council Room, gain Border Village, Procession on deck.
-- Trash the Procession, gain Council Room on deck.
- 2nd Procession plays Procession
-- 1st Procession plays a Council Room, drawing Council Room, Border Village, Procession, and 5 Coppers. Gain Border Village, Council Room on deck.
-- 2nd Procession plays Procession
--- 1st Procession plays a Jester, gaining P2's Bridge each time (their only card in deck because of Council Rooms), top-decking both, and 8 Coppers without topdecking. Nothing to gain.
--- 2nd Procession plays Procession
---- 1st Procession plays a Jester, gaining P2's Bridge each time (their only card in deck because of Council Rooms), top-decking both, and 8 Coppers without topdecking. Nothing to gain.
---- 2nd Procession plays Procession
----- 1st Procession plays Jester, gaining P2's Bridge each time (their only card in deck because of Council Rooms), top-decking both, and 8 Coppers without topdecking. Nothing to gain.
----- 2nd Procession plays Council Room, drawing 6 Bridges, 1 Council Room, 1 Border Village. Nothing to gain.
----- Gain Council Room, on deck.
---- Gain Council Room, on deck.
--- Gain Council Room, on deck.
-- Gain Tribute, on deck.
- Gain Tribute, on deck.
Play 2 Border Villages, drawing 2 Tribute.
Play Tribute, hitting Noble Brigand and Watchtower (P1's only cards in deck).
Play Tribute, hitting Noble Brigand and Watchtower (P1's only cards in deck).
Play 4 Council Rooms, drawing 16 Copper.
Play 6 Bridges.
We have played 10 Bridges, 12 Council Rooms. We have 23 buys, and well over $18 money. Everything is free, except that Colonies cost 1.
Thus we buy 18 Colonies and 5 Provinces.