I think Manabarbs is a good addition to the deck
Bruse Tarl, Boorish Herder looks like the Overly Manly Man meme, and making a deck with all the ridiculously macho cards could be funny
The fact that its Blue fits the theme, but it also means youve got access to plenty of spells that will allow you to utilise this to either control the board state, your opponents hands, their library - or basically whatever else you want
The deck starts with a number of powerful and efficiently costed toxic creates with secondary abilities including Ria Ivor (battle cry, makes mites), Vivisection Evangelist (removal), Nimraiser Paladin (reanimate), Annex Sentry (removal), Porcelain Zealot (buff) and Blightbelly Rat (Proliferate)
With Ghitu Lavarunner and Viashino Pyromancer reprinted, there is a lot of space to explore in the Mono-Red Aggro/Burn archetype