I like the list. However, there's a nonbo between Despoiler of Souls and Shadows of the Past. Also, I understand Bottle Gnomes' value here but its defensive nature does seem at odds with the Despoiler's aggressive nature.
Maybe it just means the deck can take both roles well, though
Also, the Gnomes are good at flipping Liliana.
In your experience, are the Despoilers worthy recursive threats?
Shadows of the Past is for scry. The active on it is just a bonus that happens to work well in a deck such as this. By no means does this have to be your win con, it just has the potential to be one. Gotta keep your options open, not every will play out the same.
The deck is full of creatures that either don't mind being in the graveyard or can end up there fast if they're doing their jobs. As you and your opponent continue to fight for board presence, you're fueling your graveyard making for more options in future plays. As much as the deck doesn't look like a control deck, it really is one and Despoiler is just value in a long game. If your opponent is going card for card with you, you're winning. there's also those games where you just play Despoiler turn 2 and the game ends 6 turns later.
Graveblade Marauders... yeah nonbo again with Despoiler but the way you should look at it is all 3 have synergy with your graveyard.
Gnomes basically just destroy any hopes someone might have of rushing you down. every extra turn you can provide for yourself is one step closer to putting a lock on the game. also great fuel for Despoilers, Shadows, and Graveblades. as well as flipping Lili(and sac loop w/ coin). I've even just sac'd it for scry on occasion.
tl;dr It's all a facade. Fear the Despoiler and its deceptive ways. Is it killing your 2 drop or is it killing you?
It's killing both.