How to have an overlay move to specific points at specific frames using ffmpeg
Use

ffmpeg -i C:\src\assets\video\base.mp4 -i C:\card.png -y \
       -filter_complex "[0:v][1:v]overlay=x='if(eq(n,439),300,0)':y='if(eq(n,439),300,0)':enable='eq(n,438)+eq(n,439)'[out]" \
       -map [out] -map 0:a -ss 17 C:\temp\j7kthb0v\composit.mp4


You may need to escape the commas in filters depending on your shell i.e. n,438 -> n\,438