Black Cat is basically the same as any other dog, until the other players cross its path, which gives them bad luck. In this case a curse.
Way of the Mole digs through your deck.
A Hostelry is another word for Inn. There are people at an inn, hence the actions. But you can also put up a horse at an inn, which you're buying for your treasures.
Snowy Village has people, but if it's cold out it's harder for them to get work done.
Goatherd's goats eat your cards so they can get bigger and then get sold at the market for cards. Just the thing my goats need to get big. A bunch of copper coins and several houses.
Stockpile literally lets you stockpile the card itself on the exile mat.
Way of the Butterfly is simple. Your card is going through metamorphosis.
With Way of the Owl it isn't a direct similarity, but Library and Scholar are both cards based on knowledge and Watchtower looks on from above. Owls are known for being wise, and they fly over everything.