[Modern] Help with this -1/-1 mono black

[Federico Rosano]

I'm trying to build a nice mono black modern deck. I have this idea around -1/-1 counters and I started this very early wip. Any suggestion is welcomed, just remember I'm on a budget.
Thanks in advance.

https://deck.tk/79lp6ciz

[Inphyy77]

First, and probably most important, thing to note is that Infect creatures deal damage to creatures as -1/-1 counters, and tend to be much more efficient threats than the old Lorwyn block wither cards. And I do like Crumbling Ashes as a payoff card, but having four copies seems like waaaay since one in play is just as good as four.