Money to Burn
Supply
Synergy
High (76)Engine 100%Slog 80%Trash-for-benefit 80%
Silver-play triggers + Silver gainers — Merchant + Bureaucrat
Merchant/Sauna-style Silver-play bonuses scale with how much Silver you can stack via mass gainers.
Topdeck gainer + deck-top player — Bureaucrat + Ronin
Armory/Bureaucrat/Travelling Fair place a known card on the deck; Vassal/Herald/Piazza/Gamble play it immediately.
Variety payoff + broad gainer/+Buy — Snake Witch + Change
Fairgrounds/Museum/Horn of Plenty want many differently-named cards; Workshops and +Buy make one-of shopping cheap.