I ended up using a variant of CCYB for a fun twist on defeating this FG. The deck code below uses 2 oty's in place of the 2 lava destroyers - what ended up ACTUALLY happening was that the Oracle gave me an Armagio. I used Fractal on the Armagio when I found myself with a mostly-empty hand and short on useful creatures - when I finally drew an Oty I didn't have the quanta to summon it and Morte was almost dead. Consider running 2 Armagios instead of 2 Otys.
A second Pulvy might be worthwhile due to Morte having much more than 2 GY's, but I got lucky and drew my pulvy fairly early. A few of my own cards were unupped only due to my own cash limitations.
Using stolen Graveyards, my own Bone Walls, and Pulvying extra enemy graveyards, I benefited MORE from Morte's Retroviruses (and my own frequently-dying Fireflies) than Morte did. Any time one of my bonewalls looked to be in bad shape, I activated an Armagio to both soak up all/most of the incoming damage as well as generate more bonewall. Keeping a few armagios on the field helped me force Morte to spam Plague, ensuring that my fireflies frequently died to feed my bonewall.
I'm sure that a quinted Oty would also be effective in keeping one's bonewall topped up and generating skellies, but Armagio ended up being very fun and could potentially make one or both quints unnecessary - while FFQ needs a quint, she could potentially be replaced with another Steal, a Boneyard, or even a Phoenix as alternative methods of keeping the bonewall fed.
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4sa 4sa 52r 5ia 5ia 5ia 5up 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6rn 6rn 6rn 6rn 6rn 6u3 6u3 6u3 6u3 6u3 6u3 6u7 6u7 71b 74b 74b 77f 7k2 7n3 7q5 7q5 7t9 80h 80h 80i 8pj