Check the RSS feed (http://rust.facepunch.com/rss/blog) for a new entry with the "Devblog" keyword, then send the URL to Pocket.
If
New feed item matches
This Trigger fires every time a new item in the feed you specify contains a particular keyword or simple phrase.
Then
Save for later
This Action will add a new item to your Pocket queue. NOTE: If using an RSS feed Trigger, please limit the number of Pocket saves to no more than a few hundred per week
Discover more time saving integrations for Pocket and RSS Feed