Love your strategy games? You can pick up a few that support Linux in the latest Humble Strategy Bundle (affiliate link). I will only note the games that support Linux, as there's a bunch that don't.
For $1 you will get Planetary Annihilation: TITANS and some Company of Heroes 2 DLC designed for the WDC charity.
If you pay more than the average you will get Empire: Total War Collection, which was ported to Linux by Feral Interactive and also 66% off Total War: WARHAMMER which was also ported to Linux by Feral Interactive.
For the final tier of $12, you will get the rather great simple RTS Tooth and Tail, one game I'm quite a big fan of. It's very much a strategy game for those who don't have a lot of time, so it appeals to a wider set of gamers and it's quite challenging.
While there's not a lot in the bundle for Linux, the games that are there are pretty good. You've got ~13 days to grab a copy, so plenty of time to decide what you wish to do.