If you’re looking for a proper way to phrase or share information about the game, it's best to stick to legitimate sources. Using "cracks" or "free product keys" often leads to malware, account theft, or non-working files.
"Just Cause 3 is currently on sale! Grab the Steam key for a steal right now."
"If you love open-world chaos, you need to check out Just Cause 3. Definitely worth the purchase."
If you want to share a post about getting the game legally for the best price, here are a few better options: