Baron : Terminal money, +buy
Coppersmith : Terminal money
Counterfeit : Trasher, +buy, Treasure, "throne room family"
Embargo : One shot, terminal money, Action-silver, counter
Explorer : Silver gainer, Gold gainer, terminal money
Harvest : Terminal money, discarder
Herbalist : Terminal money, +buy
Ironmonger : Cantrip, Iron thing
JoAt : Silver gainer, trasher, "library family", counter
Mint : Trasher, gainer
Pawn : Multiple choice
Poor house : terminal money
Rats : Cantrip, trasher, gainer
Treasure map : Gold gainer
Tribute : Aleatory
Any card that can give +2 action or more each time you play it : village
(nobles is considered as a village, because you can play it each time for +2 action, unlike tribute or crossroads…)
Any card that give +1 card and +1 action without decreasing your hand discarding cards : cantrip
(I consider upgrade and rats as cantrips, because generally trashing is a benefit, not a disadvantage. While I wouldn't consider warehouse as a cantrip, because except if you have a tunnel in hand, discarding is a disadvantage).
TR family : Throne room, King's court, Golem, Counterfeit, Procession
Library family : library, Watchtower, Jack