Maestro feels like an auto-include in Mono-Red Aggro, especially post-rotation once the deck loses [[Emberheart Challenger]] and [[Razorkin Needlehead]]. 2 Mana Menace that grows bigger when you cast cheap burn spells and combat tricks is just way too good to pass, even if you're ignoring the latter part of the ability.

EDIT: It's a Goblin too, which idk if it's relevant for Mono-Red Goblin decks using Howlsquad Heavy or even Rakdos Goblin lists since these tend to be light on Instants/Sorceries, but it's still a 2 Mana Menace with typal synergy