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Set: Titan Masters Attack
Number: 015
Rare
0★
+2
While the upgraded character is attacking an Autobot

🠪 The upgraded character has +1

.
While the upgraded character is attacking an Autobot

Leader

🠪 The upgraded character has
Pierce 3.
If the upgraded character is attacking an Autobot Leader, does it also get +1 attack from the first ability?
Yes. Both abilities apply and the upgraded character gets +1 attack and Pierce 3.
Source: Wave 5 FAQ
If one of my characters has a Weapon or Utility in its Armor slot (e.g. Energon Mace), can I play Ghost Shield to upgrade that character?
No. In order to play Ghost Shield, it must replace an Armor in that slot.
Source: Wave 5 FAQ
Can I put this on Decepticons?
Yes, just because it is an Autobot card doesn’t mean that restricts who you can play it on. Take Energon Mace as an inverse example.
Source: Alpha Trion Protocols:Wave 3 FAQ
In bot mode, Optimus Prime, Dark Awakening gains the benefits of his faction Upgrade ability as long as the faction Upgrades on him aren’t Autobot or Quintesson.
As of this (FAQ's) writing, these are all the faction Upgrades that Optimus Prime, Dark Awakening can utilize to buff your team.
Autobot:
Decepticon:
Mercenary:
Quintesson:
Source: BFA World|Strike:Wave 1 FAQ