One problem with Skull Bucklers in pvp2 format, is even after the creatures change, they'll still do damage to you. Without healing, you'll still die eventually.
I would definitely take out some of your Arsenics. The deck's not really made to stall, so it would need to be at least 5-8 cards smaller.
Some options you could think about would be to drop some shields and Graveyards and add in more CC cards to help keep your opponent's damage off. Retrovirus both fuels your Graveyards and can kill off a bunch of creatures, while also making them more vulnerable to your Skull Bucklers. If you still want to run the deck in the low-to-mid 30s, I'd suggest adding in some Congeals. They can help against the high HP or momentum creatures, and also, your extra
quanta won't go to waste.