Because Orcs! And Gargantaur!
Seriously, though, it actually does work. Kind of a silly lark and not super fast, but fun to play. Orc Vet is the key, as he can self loop if there is enough red, since his attack starts quite high with bonuses. Gar’Nok and Ogryn can help with spawning and Firestorm, respectively. Gargantaur is there primarily as a cheerleader but can offer a big finish too.