Regarding Graveyard hate, I've noticed that many combo decks (that care about their yard) will make sure the coast is clear using Probe/Duress/Thoughtseize/Cabal Therapy/etc. If my graveyard hate piece gets ripped, it gets ripped. I've been looking at
Purify the Grave as a way to "answer" getting Duressed. Assuming I have a land in play (hopefully), if they Duress and I'm holding Purify the Grave, I can still interact (somewhat) with my opponent and that may buy me 1-2 turns while they figure out how to get around Purify's flashback. Idk, just spitballing, but having played with Surgical Extraction in other decks, I find that it doesn't even matter sometimes when I get it discards (or I have to respond and use it on something completely worthless or just plain lose it) whereas I feel Purify the Grave might still have some value.