Namely Elspeth, Sun's Nemesis and Ashiok, Nightmare Muse
Hollow One cares specifically about the word "discard." Wraith's two-life cost makes it a tough sell in other decks thanks to the format's aggro decks, especially Burn
The dozen or so Nightstalker creatures were used sparingly in Magics early days, and for some reason they all have guns
The need to exile lands becomes more and more prevalent as graveyard strategies creep up in power
On the other hand, theyll try to play these cards in a spot where they have protection for it as well in the form of Rattlechains or a counterspell, so the key is to ignore their small, irrelevant creatures and then engage in a counter-war over their key cards as likely you will need two, or even three, removal spells to get through their protection
If youre not in the market for collecting entire sets, then you can pick the cards you like or want and build a fun deck, and earn some rewards at the same time