This deck is built to play a longer version of the game than most Tri-Brigade decks. This is a bit off the beaten path, and any advice or insight you might have I am open to.
The deck's main goals are two-fold: use the Tri-Brigade monsters to get out their bosses and create card advantage, and use the Melffy engine to remove opponents cards and negate their effects. I won't go over the Tri-Brigade strategy here because I believe most other Tri-Brigade deck-lists have it covered better than I could. The Melffy engine is similar to most others you will see: use Puppy to pull out Kalantosa who then pops a card. We are Tri-ing (sorry) something a bit different by including Melffy Pony and Melffy Fenny. Pony can put Kalantosa back in hand from the GY, and Fenny can summon a Kalantosa from hand (useful if we hard-draw it or recurse it with pony).
We also included the Hop Ear Squadron and Valerifawn, both of which are tuners. We can use those to make Herald of the Arc Light for a negate, or Jiujiu for staying power (it is very easy to get 2 monsters with the same type and attribute in our GY). The only other real departure for our deck from the norm is two copies of Pot of Avarice. Since we want to play a drawn out game, this card helps control our GY, returning any Melffys sent there and recursing our link monsters.
Thank you for taking the time to read this, I hope you like my deck!