At HumbleBundle you can currently get an very interesting Bundle for strategy-gamers on Linux: the Humble Paradox Bundle 2019.

From $1 on you'll get:

- Age of Wonders II: The Wizard's Throne
- Darkest Hour: A Hearts of Iron Game
- Magicka 2 (Linux native)
- Crusader Kings II (Linux native)

If you pay more than the average (currently at $6.10) you'll also get:

- Age of Wonders III (Linux native)
- Crusader Kings II: The Old Gods DLC (Linux native)
- Europa Universalis IV (Linux native)

And if you pay 12$or more, you'll also get:

- Steel Division: Normandy 44
- Age of Wonders III - Deluxe Edition DLC (Linux native)
- Magicka 2 Deluxe Edition DLC (Linux native)
- Europa Universalis IV - El Dorado DLC (Linux native)