With the little time I have dedicated to the deck until now, I have to say that I never had the need to find DRS with GSZ. When I want a mana dork search Dryad Arbor and when need graveyard hate go for Scavenging Ooze even if I have to wait a turn. I prefer a maindeck solution for Blood Moon, equipments and Counterbalance apart from Abrupt Decay with the Qasali Pridemage. In addition, DRS could be a death card in hand because of our Chalice of the Void. About the DD + TS combo, I am not running it because I do not want more singletons that makes the deck less consistant nor play more than 25 lands, because I have played some games in which I did not have CA engine so I was going to the topdeck and only drew lands and more lands... The only reason I thought the combo was because is sexy have a wincon with the Loam by itself, but not end to convince me.

Apart from suggestions (thanks for them), do you consider BUG variants as favorable matchups? I could see that we lose a lot of potential in matchups in which Chalice of the Void is regular or bad, matchups in which you can lose your wincons easy with an Abrupt Decay.