Nice.
I've got a card, here are my attributes.
Playability: When can I play it, and how does it help with playing other cards? (Consider turn phases, +Actions, +Villagers and text such as "play a card".)
Deckbuilding: How does it change what cards belong to me? (Consider gain, trash, exile from supply, return, exchange etc.)
Card management: How does it move my cards between my drawpile, hand, discard pile and set-aside areas? (Consider +Cards, discard, topdeck, exile, set aside etc.)
Payout: What can it give me in terms of Coins, Coffers, Buys, Favors and VP?
Expansion: Which set(s) is it in?