I did have a Xarthisius, Gaunter, Guardian deck (plus other cards that see opponent's deck), but i deleted it this patch after 5 losses in a row. Maybe it was bad luck and not the deck's quality, but i wanted to try new decks anyway.
Also, careful with Reinforcement (NR silver), Nature's Gift (SC) and Marching Orders. I've been screwed by those cards, putting dangerous golds and silvers on the bottom of their deck, only for them to be summoned with those cards anyway...