So as long as it's not catastrophically biased (like NEVER showing a couple of sides or almost always rolling the same side) and you do a lot of rolls, you're good. You can even try encoding the rolls of the die in some way using a mapping of characters to multiple dice rolls, into a passphrase on top of your existing ColdCard, if you use enough entropy for safety, as a temporary solution for convenience (if you're still using the ColdCard to get funds out of it and also needing the same device to put the funds onto)
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And 50 rolls with high quality dice or like 64 rolls with almost any dice will do the trick just fine as a temporary solution. Just make sure the encoding handles it. You can pick a mix of 36 letters (upper or lowercase) or special characters, map two die rolls to each one (you can do a,b,c corresponds to 1,1; 1,2; 1,3; ghi to 2,1; 2,2; 2,3; etc.) and then that can encode 64 dice rolls in 32 characters. Write that down to store securely where you keep your backup, after also inputting this into the enter passphrase option on the ColdCard. This is enough entropy that it can't be cracked if my understanding is correct, but think about in the near future migrating to seedsigner with a new key or with multiple keys in a multisig (seedsigner works great for those) generated from scratch with 99 dice rolls ๐ค
The good thing we are all getting a lot of practice with our cold storage setups lmao!