They're cheap and at most craft stores. Small enough to store with my dice.
Also, the card was a cool Christmas gift, it's a custom card of my dog.
Gives me a christmas card idea where there's a custom magic card for each of us and lines to cut them out so you can play with them.
Someone should do that as an etsy shop or something.
I'm thinking about the Christmas letter idea more: each person's card could reflect a life event from the last year - for example, my dad sprained his knee so his card could be an aura debuf with knee-sprain flavor text or something. Then the letter could go into details on our last year in the sections that aren't meant to be cut.
Pretty sure I'm 100% doing this next year. Wish I thought of it a month ago!