Tormented Hulk giving a creature +8/+8 and -5/-5 is weird. Why not just make it a 3/3? Or have the -5/-5 be conditional. Pretty interesting mechanic idea but without any costs associated with it, it's too repeatable, fast, and free to not be absurdly broken.
Creature - Demon
Infectious Surge 2BB (Exile this from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature spell. It keeps those counters when it resolves.)
When you activate the Infectious Surge of Grumpy Nalfeshnee, put a flying counter on target creature spell.