A few months ago I was so bored at work I would spend hours at a time combining exotics in my mind trying to come up with the best combination of 2 or 3. The most OP exotic I could create was the following Super Bad Breath (Super good advice, Bad Juju, Dragons Breath) Heavy machine gun, with all Super good advice stats but with all 3 exotic perks Essentially it's an unlimited ammo fireball festival. Every bullet makes a solar grenade and since almost every shot is returned to the magazine, you can make a shit ton of fireballs. Not to mention if said fireballs kill something, my magazine is refilled thanks to the bad juju perk. Death, hell, and of course Super Bad Breath.