Pull Requests: Big or small?

Hello,
I'm planning on implementing some cards that are missing, to get familiar with the project. Do you prefer larger pull requests with several cards, or one per card? Are there preferred naming schemes (et cetera) for requests/patches?
I'm planning on implementing some cards that are missing, to get familiar with the project. Do you prefer larger pull requests with several cards, or one per card? Are there preferred naming schemes (et cetera) for requests/patches?