Here are some equip cards with useful effects that you can put onto Armed Protector Dragon. Even if you do not pay the LP cost of Mask of Brutality it will not be destroyed because of Armed Protector Dragon. You do not have to worry about Big Bang Shot working against you because it cannot be destroyed. Armed Changer lets you retrieve monsters with lower attack than the equipped monster, which could be almost anything with enough equips on Armed Protector Dragon.
Equip PotG to this card. This card protects PotG from destruction, and PotG protects this card from destruction.
Meaning, you have an invincible wall that can only be stopped by non-destruction removal. Banishing the PotG works, but it also means your opponent is potentially wasting a Cosmic Cyclone on this combo instead of your other potentially more harmful backrow cards.