With the sword in play, whenever Cav of Dawn attacks, colorless Golem tokens are created each time it proliferates.
It was a big surprise when I played this combo. I had a couple of vanguards in play, Grateful apparition, and Cav of Thorns.
This was in standard training grounds.
@BlessedOne - having problems following your problem. Are you saying that your opponent gets a huge golem stack? Or that this interaction whittles down your creatures? You do not specify which vanguards you had in play, but as far as I can see there is nothing in the cards listed that is responsible for the excessive golem generation described.
I am seeing the same bug as BlesseOne reported.
I play Cav of Dawn with Sword of T&J (and without any vanguards in play), and each time the Sword triggers proliferate effect on Cav of Dawn, a golem token is created on the opponent side. So the opponent got a huge golem stack excessively.