Some surprising and nice things I found:
Rishkar, Peema Renegade both clears -1/-1 counters, and gives all of my creatures *with -1/-1 counters* a ramp ability.
Thief of Blood is a circumstantial bomb.
Grim Affliction is surprisingly nice, because it gives me a minimum of 2 -1/-1 counter events. The Liliana Amonkhet Planeswalker deck includes two perfect cards for this deck.
Glistening Oil gives me a lot of -1/-1 counters during the game, though it introduces infect.