That budget will get you to low settings not medium unless it's on older games. Plus the CPU you have will not run newer games past low settings if at all.
Need to spend about $70-120 for a gaming video card unless you buy used.
Also need to know your power supply brand and model and case size.
GeForce GT 730 64-bit GDDR5, Radeon R7 240 woul be the lowest cards you want to get new for gaming. Radon 7750 is OK also if you can get it.
If you have the power supply to run it, the Radeon 7770/ R7 250X is the next step up and will get you to Medium settings in newer games once you upgrade your CPU.