[EDH] Fain, Warmonger

[Jaleath]

Hello friends, I brought you my spicy new mono black deck, Fain, the Broker.
https://deckstats.net/decks/150242/2245036-fain-modular-broker

This deck looks to win with Fain on board without summoning sickness and Thornbite Staff equipped. From there, we need to get a second sac outlet and Lesser Masticore. Tap Fain, sacrificing Masticore and putting two +1/+1 counters on himself and untapping with Thornbite. Masticore comes back with a -1/-1 counter with Persist, and we tap Fain again to remove it, creating a treasure. We sac it with our second outlet, untapping Fain with Thornbite and bringing Masticore back with a -1/-1 from Persist, and we're back where we started, up one treasure net.

This makes infinite treasures, which lets us activate Fain an infinite number of times. We can win here with Blood Artist/Zulaport pings, Thornbite pings, Masticore pings, an infinite number of infinitely big Inklings or Mega Modulars, or an X=1000 Torment of Hailfire.

We can also generate infinite mana with Cabal Coffers, Deserted Temple, and Rings of Brighthearth if we can make 6 swamps (3+Urborg is best). Pay 2, tap Cabal for 6, pay 1 and tap Deserted Temple to untap Cabal Coffers. Pay 2 to Brighthearth and copy the activation, totaling pay 5 for 6, netting one black mana per loop. Close out the game the same way.

What do you think? Finding a Modular sans-W commander has been a challenge, but I think Fain synergizes incredibly well with them, since all of them are usable with any of his 3 activated abilities. It's really easy to spiral with 2 Modular cards and Persist with Fain, since SBAs happen at the same time and the Modular trigger still goes on the stack when it leaves play. Any suggestions for the brew?