Don't get the temp card, it's really not worth it. Do get the diamond homes, it is SO worth it. As was told me and I have learned from experience, you'll get the diamonds you need from mining and playing long before you get the dcd for a warp card, even if you're straight up buying your elytra with diamonds. I know I did. Save your dcd for mending and fortune 3 books and diamond homes, and start chipping stone.