Do you have a sadistic side that enjoys hurting the opponents' creatures as well as your own? Do you enjoy having cards that you can use it more than one way (example: Turning Lightning Bolt into a Draw effect)? Do you love the feeling of destroying your opponents with 50+ damage in one go?
If you answered "Yes" to any of these, I have the honor to present you:
S&M Festival
where it seems the Boros have started to get corrupted by the Rakdos' lifestyle!
Main Deck
This is deck which was innicially mostly based around trolling the opponent with Stuffy Doll, but through modification it tends to only be my late-game finisher, letting Boros Reckoner do most of the job instead.
EDIT: With M21 introducing Brash Taunter, the Stuffy Doll ended-up being removed from the deck altogether
When I have either Dictate of the Twin Gods or Furnace of Rath on the battlefield and I target my Stuffy Doll with a Lightning Bolt (for exemple) Stuffy will receive twice the damage to then redirrect 4x the damage to the opponent.
Soulfire Grand Master is a cool card to allow me to survive surprisingly a lot longer; In my previous mono-red version of this deck, playing Dictate of the Twin Gods would often put me at higher chance of being killed more than actually helping me.
When this deck was mono-red I had Spitting Earth, but I switched to Skred which is simply better in every way possible. Obviously trading all my Lands for Snow-Covered Mountains and Snow-C. Plains. I'm not sure if adding Arid Mesa would really benefit this deck, since this deck is only 2 colors and through playtesting I didn't get any problem at getting my colors. Afterall it helps that Boros Reckoner is paid with mana.
Swans of Bryn Argoll is a really fun card to target with cheap burn to draw a good amounts of cards. Lightning Bolt=: Draw 3 cards.
( ͡° ͜ʖ ͡°)
Blasphemous Act is a really powerful card that will cost most of the time only or less. [Most of the time...] it will boardwipe the opponent, trigger Boros Reckoner's or Stuffy's ability to deal massive damage to the opponent (even more with a Dictate on the field... 56damage per Stuffy/Reckoner), and allow me to draw 13 cards if I have a Swan to find what I may need to finish off the player + most of the time I'll have the only creature left on the field, the Swans, and I can use them to deal some additionnal damage.
One thing I may have to be careful about is to avoid milling myself to death when playing Blasphemous Act as both Swans of Bryn Argoll and Dictate of the Twin Gods are on the battlefield.
Boros Charm is a good protective card that allows me to either let a Reckoner survive some of my burn (or enemies' "Destroy" cards) or either be used late game for a dirrect final blow to the opponent.
Pariah feels almost cheap as it can entirely knock down some decks which lack control, by enchanting either a Doll, a Reckoner or a Swan (once again It can mill myself tho).
Sideboard
Sideboard-wise, Rest in Peace is always a good card against Dredge or Reanimator decks + I removed my only Flasback card in the deck (Faithless Looting).
Blood Moon is a really strong card in the current meta where everybody runs some Fetch-Lands, Shock-Lands and other Dual Lands.
Even though, they are kind of rare, it also totally knocks down Maze End decks unless they are prepared against Blood Moon specifically. (In my own Maze End deck, which is still private, I included stuff to be able to play against Blood Moon.
Pit Fight is only there if the opponent plays with massive creatures, to force them to damage a Reckoner or a Doll. But to be honest, I just didn't really know what to put in those sideboard slots.
I like to keep Wear / Tear handy in case, you guessed it, the opponent relies heavily on an artifact or enchantment... or if his/her deck is entirely built around those kind or permanents.