Red Resonator is a really important card in this deck, normal summon Red Resonator to special summon a level 4 fiend monster from your hand. (Such as Red Sprinter, Red Familiar, Performage Hat Tricker, etc.) You will then be able to synchro summon Red Rising Dragon from your Extra Deck. By using Red Rising Dragon's effect you'll be able to special summon Red Resonator from the GY and use Red Resonator's special effect of targeting a monster on the field to gain LP equal to the monster's ATK. You can then synchro summon for Scarlight Red Dragon Archfiend. Keep repeating this process and you'll have multiple synchro monsters on the field. Hot Red Dragon Archfiend Abyss is a good card to synchro summon for, use something like Synkron Resonator or Chain Resonator to synchro summon it with Scarlight Red Dragon Archfiend. Hot Red Dragon Archfiend Abyss can use it's effect of negating your opponent's face up card once per turn. Using Hot Red Dragon Archfiend Bane's effect of tributing 1 monster to special summon 1 "Red Dragon Archfiend" monster from the GY is a must-do if you want many synchro monsters on the field. Counter field sweeps with Hot Red Dragon Abyss's effect.
Pretty fun deck, not too competitive.