https://www.gamespot.com/articles/last-chance-get-overwatch-and-mystery-pc-games-for/1100-6461636/

If you haven't heard, October's Humble Monthly is a big one. If you subscribe between before October 5, you'll get immediate access to Overwatch, Blizzard's enormously popular hero shooter that normally retails for $40. A one-month Humble Monthly subscription only costs $12, and Overwatch is yours to keep and play forever, even if you unsubscribe.

On October 5, a number of other games will be revealed that you'll also get to keep, including two "early reveal" games Humble already announced: Dungeons III and Hidden Folks. This is already an incredible deal for anyone who games on PC and hasn't picked up Overwatch yet--and it comes just in time for Overwatch's Halloween Terror event.