The latest game of the other big turn-based franchise from Firaxis, XCOM 2, can be played for free this weekend (December 9 – 13) on Steam. In case this gives you enough taste for the game, it is also discounted down to 4.99€ until December 16.
You can find all the relevant infos on Steam: https://store.steampowered.com/news/app/268500/view/3100162842716516119