In 10-15 minutes of time;
10 KB swings
As many rounds as possible. Try to beat your record of rounds each time.
Every Minute on the Minute (EMOM) Clean and press
That video captured a pretty subpar version of this, but it gets the point across. I did this with a 150lb sandbag once and was completely floored. Find the weight that works for you.
Additionally, check out all the workouts here
Medleys will kill your soul in short order
Anything tabata (yes yes, I know purist; it's not tabata unless you're measuring your VO2 max on a bike). I like burpees, clean and press, safety squat bar squats, pretty much anything you can do full body.
I do realize most of these cross into the realm of conditioning vs cardio, but they'll still get your heartrate pretty jacked.