I looked through all Gods with Permanent Control to see if Plate Armor > Protect Artifact.
Chaos Lord: possible perm control (mutation). The shield is hard. Winning can be possible. 5 PA not needed. Plate Armor is definitely better.
Divine Glory.
Strategy doesn´t work (Glorys can´t be eaten, Grav Shield useless)
Dream Catcher: low health creatures. Early quinted Oty can be a possible way to win. Plate Armor can be useful. It negates the creature control. PA only useful for Towers. Gravity Shield useless.
Eternal Phoenix:
Faster than you. No chance.
Graviton:
Many creatures have 5 health. All have more than 4 health. You can only kill something with oty+momentum+quint.
Plate Armor more useful than Protect Artifact.
Hermes:
Should be faster.
Obliterator:
Protect Artifact can be better that Plate Armor. Diamond Shield, Unstoppable on a dragon or burrowed shriekers can be hard.
Octane: Nothing to kill here (except later, when he played 3 Unstable Gas with Eagle´s eye on the field. Plate Armor more useful than Protect Artifact.(Eat the Eyes on the field). The Eyes come seldom enough to eat them. The Eagle´s Eye in the slot can be a problem.
Rainbow: No idea how good your deck is.
Seism. Possble, when your combo stands. Protect artifact better than Plate Armor.
So far: 4:2 for Plate Armor against Protect Artifact. And Plate Armor can help against other decks, too. Protect Artifact not.
I suggest: 1 Protect Artifact for Eternity or Graveyard. 3 Plate Armor, maybe +1 Oty.
I think you need some damage without Graveyard ,+1 Pharaoh (fits to your towers, synergy with the strategy).
Quintessence is ok (1 for Druid, 1 for Pharaoh/Queen, 1 for Oty)
Maybe you have too little towers.