There are many free pack codes that can be used to try out new sets. I have tried redeeming some of them which gives me an error prompt that says “code already redeemed” which is impossible as no one else uses this account and I hadn’t ever seen the code until I had typed it in. This continued to happen with every single other code I attempted to redeem. Some of this codes give you specific card sleeves or items those of which I have none so definitely not something I forgot about.