Can Quartermaster be used on Sergeant Cog? If not, is there a way to revive Cog from the KO/discard area for use again?
No, and not currently…
Optimus Prime - Battlefield Legend
will get the +3 attack, but since the weapon with the very long name was attached after he began his attack, the ability will not trigger and you will not be able to scrap any cards to add to your attack.
Yes, it can.
You previously ruled that Captain Ironhide
can't use his Bot Mode ability to swap his weapon for an Energon Axe
if he is undamaged. Does this also extend to other Upgrade movement effects? Does this mean I can't use Quartermaster or Private Red Heat
to move an Energon Axe in play from a damaged character to an undamaged one?
That is correct. Energon Axe
can only be put on damaged characters.
Why is it you cannot increase a character’s attack with a reattached Battle Master
during an attack, but you can increase Optimus Prime - Battlefield Legend
’s attack if you flip an action like Leap into Battle? How is this any different to using OPBL’s skill to play Quartermaster and attaching a battle masters upgrade form before defense flips?
You can use Quartermaster to attach a KO’d Battle Master
to OPBL. If OPBL’s ability results in a weapon being attached to him (for example via Quartermaster), the attack bonus of that weapon will apply because you haven’t counted attack yet. However, if the weapon gives the character bold, bold will have no affect because you’ve already flipped battle cards.