Warlord! Mike Grell’s magnum opus, if you don’t count all his Green Arrow stuff. Which you really should. Here’s a list of what we’ve got as of 4/5/19:
Crisis on Infinite Earths
Legends #4
Warlord (1975) #114-115
Aquaman (1994) #71-73
52 #3-4
Justice League (2011) #40
Convergence
Cass is a girl very close to my heart, but compared to the knuckleheads I’ve previously featured in this thread, she’s appeared in a LOT of comics in the last 20 years. So this is a pretty tall order. Maybe someday, but for now I’d prefer to stick to more obscure characters.
But hey, just so you don’t go away empty handed, here are some recommendations for my favorite Cass runs on DCU as of 4/5/19.
No Man’s Land (Collection)
Batgirl (2000) #1-11
Batman & Robin Eternal
Detective Comics (2016) #934-974