It's not much of an Infernity decks if there's only like, seven infernity cards, here's mine, if you want to give it a shot:
Monsters
Fabled Dianria 2
Fabled Raven 2
Fabled Soulkius 1*
Infernity Archer 1
Infernity Archfiend 2
Infernity Avenger 2
Infernity Beetle 3
Infernity Destroyer 1
Infernity Guardian 2
Infernity Knight 1*
Infernity Mirage 2
Infernity Necromancer 2/3
Infernity Randomizer 2
Spells
Back to Square One 2
Infernity Launcher 1
Monster reborn 1
Monster Reincarnation 1/2
Mystical Space Typhoon 2
Zero Max 1
Traps
Dark Bribe 2
Infernity Force 2
Infernity Inferno 1
Infernity Reflector 2
Mirror Force 1
Solemn Judgement 1
Solemn Warning 2
Trap Stun 2
Traps Geared towards protecting mons, spells for recovery/discarding, side deck up to you but I recommend imperial iron wall for vs. chaos dragon/piper decks
Extra
Blood Mefist 2
Dark End Dragon 2
Hundred Eyes Dragon 2
Infernity Doom dragon 2
Stardust Dragon 1
Red Dragon Archfiend 2
Red Nova Dragon 2 (combo with beetle)
Void Ogre Dragon 2
Edit as you will, * indicates if you want to remove a mon, you should remove that one
Reduce XZY mons for synchros, only have maybe revise dragon, hope and zenmaines, if any