Does a mintheif's summons (i.e. rat swarms) and victims of submissive affliction's bottom half get the benefit from the Mindtheif's augments (as long as they are melee attacks)?
So for example, if I make a guard attack their neighbor with submissive affliction, and have The Mind's Weakness in play, does it become a 4 attack?
No. The Mindthief isn’t the one doing the attacking, and augments apply only to your own attacks.
Spoilers for a later-level card:
Spoiler (click to reveal)
There is a card at level 8 that has a similar effect to Possession, making one of your allies attack, that specifically says that your augments apply to the attack. That’s the one exception to the above statement.
