I think poison deck doesn't work very well against this deck, since poison deck takes ages to set up...
and by then, the chargers and titans have already destroyed the opponent... unless they have mass heals (aka miracles, and stone skins)
There are quick poison decks like death/water speed poison. Just not faster to counter the upgraded Gravity.
and btw, Titans have been nerfed in 1.25 and now their flying stats are 8|50, not 8|70.