Hold all the aces
Definition 1 of 2
Pro Tip 1/3Card Game Origin
The phrase comes from card games where 'aces' are high-value cards, symbolizing strong advantages. 
With her qualifications, she holds all the aces in the job market.
Pro Tip 2/3Metaphorical Use
Often used metaphorically to describe non-physical advantages like information or resources. 
Owning the patent means he holds all the aces in the industry.
Pro Tip 3/3Conversational Tone
It's a casual expression, suitable for everyday conversation rather than formal writing. 
Because I knew the secret, I held all the aces at the meeting.