I would balance third hand, one third hand and two deck swaps, lets you cycle infinitely
i.e
Graveyard: weapon, deck swap, third hand
Hand: Deck swap
Play deck swap, play weapon, play third hand, and you have reset and can repeat. It does help that you are forced to take cards, making this setup hard to draw, but w/ 3 deck swaps and two third hands alongside a draw/knife build, I get this very often. You could change it to limit each third hand to one use per turn, or you could make it only playable once per game by putting it in a different zone after playing it; think Magic the Gatherings exile.
It was a great game, though!