BPM: Bullets Per Minute God Run Compilation

Odr Run (Hard, before Overdrive patch): Helmet of Rage (4x damage at max rhythm), Face of Death (2x damage), Giant Slayer Boots (%health damage), Powershot Glove (Penetrating bullets, garbage), Sawed off Shotgun (+6 max clip)
Geri Run (Hard): Horned Shot (Explosive shots, scales with damage), Battle Lion Shield (50% Cooldown Reduction), Quaternote (Yes, that's how it's spelled. Shoot twice per shot), Giant Slayer Boots (%health damage)
Explanation: Fire and reload speed are actually cooldowns in-game, meaning that full beat guns can shoot on half-beat. Half-beat guns can shoot on quarter beat. This effectively allows you to spam click fire and reload to spew out damage. If you have the Six Shooter (double time reload), you halve it again, effectively allowing you to spam click without ever losing the rhythm bonus
Skuld Run (Hellish): Hat of Madness (Delayed explosive shots, scales with damage), Face of Death (2x damage), Giant Slayer Boots (%health damage), Dwar Ien Braclet (Yes that's how they spelled bracelet. Reveals map)
Sanngriðr Run (Hard): Ymir's Crown (Shots are echoed a half beat later, same damage), Helmet of Rage (4x damage at max rhythm), Face of Death (2x damage), Giant Slayer Boots (%health damage)
It's pretty easy to tell which items are busted. Items such as The Best Defense (infinite ammo), Dragon's Skin (Shield regen, max 25 shield for regen), Tampling Boots (Yes that's how they spell it, kills enemies under a certain %health threshold), Circlet of the Serpentine (Heal for 1-3 life on hit) are also incredibly powerful.
I also keep all my god run save files, so I'll likely upload a part 2 :)