You said it can work for anything but FG... but what about HB 
You just plain outrush them, it can lose of course, but it should have a decent win rate.
HBs ... erm ... cough. Despite the full-bodied announcement it's not really suited I suppose.
I remember playing and winning against them because, just like icecoldbro said, they seem
a bit surprised by some 34dmg on a turn4 table.
On the other hand, whenever I do bother to play vs lvl5 with any deck, they also seem to
have an aweful lot of lightnings, mutations, bolts and other nasty CC-stuff ... lose a couple dragons
and you're toast.
