A hostage to fortune
Definition 1 of 1
Pro Tip 1/3Metaphorical Usage
The phrase is often used metaphorically to describe creating potential future problems. 
His controversial statement was a hostage to fortune that hurt his career years later.
Pro Tip 2/3Predictive Caution
Use this phrase to warn others about the possible negative consequences of their actions. 
Her aggressive investment strategy could become a hostage to fortune.
Pro Tip 3/3Emotional Impact
When spoken, it usually implies worry or criticism about a possibly imprudent decision. 
Promising early delivery to the client might turn out to be a hostage to fortune.