Before the start of the game: 5 (Baker, Black Market, Knights, Rats, Young Witch)
When you shuffle: 1 (Stash)
At the start of your turn: 8 (Caravan, Fishing Village, Haven, Horse Traders, Lighthouse, Merchant Ship, Tactician, Wharf)
When you would play this: 1 (Band of Misfits)
When you play an attack card: 6 (Beggar, Horse Traders, Lighthouse, Moat, Secret Chamber, Urchin)
When you discard this other than during a clean-up phase: 1 (Tunnel)
When you trash...
...this: 9 (Catacombs, Cultist, Feodum, Fortress, Hunting Grounds, Overgrown Estate, Rats, Sir Vander, Squire)
...another card: 2 (Market Square, Possession)
When you buy...
...this: 7 (Doctor, Farmland, Herald, Masterpiece, Mint, Noble Brigand, Stonemason)
...another card: 7 (Embargo, Goons, Haggler, Hoard, Hovel, Merchant Guild, Talisman)
When you would gain...
...this: 1 (Nomad Camp)
...another card: 2 (Possession, Trader)
When you gain...
...this: 7 (Border Village, Cache, Death Cart, Embassy, Ill-Gotten Gains, Inn, Mandarin)
...another card: 4 (Duchess, Fool's Gold, Royal Seal, Watchtower)
At the start of your clean-up phase: 2 (Scheme, Walled Village)
When you discard from play...
...this: 4 (Alchemist, Herbalist, Hermit, Treasury)
...another card: 1 (Scheme)
When you would draw during your cleanup phase: 1 (Outpost)
At the end of your turn: 1 (Possession)
After the end of your turn: 2 (Outpost, Possession)
While this is in the supply: 1 (Duchess)
While this is in play: 12 (Band of Misfits, Goons, Haggler, Highway, Hoard, Lighthouse, Merchant Guild, Princess, Quarry, Royal Seal, Talisman, Urchin)
While something else is in play: 1 (Grand Market)
Once this has been played, until the end of the game: 1 (Embargo)
During your buy phase: 1 (Peddler)