Essence, it should be pointed out that the Half-Bloods ALL have Quantum Pillars/Towers, so any deck that had Water or Earth could use Chrysora or Pulverizer, but only two could use them effectively.
This. With Quantum Towers a Deck only needs one of the two elements to play the cards.
Quantum Towers are more then enough to get the 1 or 2 Death quanta a turn to work the Chrysaora for a deck with just Water and the Death decks only need to get a few Water quantums at all to play the Chrysaora.
Earth Decks can't use Pulverizer often unless it's an upgraded one which is much more cost efficient but even just 1 or 2 Shields destroyed over the course of the entire game can ruin you. Gravity Decks will have no problem getting the 3 Earth to play Pulverizer and can then use it's ability at will.
Not to mention the Poison coming from either Arsenic or direct Poison cards.
I've actually had much better results today, I haven't come close to winning back what I lost before but I am at least starting to win 60% of the time.