I am a dkcr enthusiast but I dont have a capture card how do I record my runs

either buy a capture card or point a camera at the screen

You can record ILs with anything thanks to the replay function, but full-game is a bit trickier, and I have problems capturing it myself. The best I can suggest (and what I do) is propping up your phone to point at the screen (either between objects or on a stand), but depending on your setup it may give you a really bad angle (like it does for me).