https://www.gamespot.com/articles/next-amazontwitch-prime-freebie-available-now/1100-6456010/

Amazon Prime members can now claim another freebie from Twitch. Beginning today, January 10, you can snag a pair of free Kobolds & Catacombs card packs for Blizzard's collectible card game, Hearthstone, for a limited time.

To receive your card packs, you'll need to have an active Blizzard account with a free Hearthstone license and link that with your Twitch Prime account. You can then simply head over to Twitch and click the button at the bottom of the page to redeem the offer. The Kobolds & Catacombs packs will be available until February 10, giving you a month to claim the items.