What’re your underrated mono-red cards?

I love looking at and playing really niche and largely undiscovered/forgotten cards in my mono red decks.

For me, one of the most sleeper powerful cards in my EDH Hazoret Aggro deck is [[Fires of Invention]]. This absolute bruiser of an enchantment effectively doubles my mana from turn 4 onward, and even leaves my mana open for activated abilities like Agg. Assault. Not to mention that if I play it on curve I can immediately cast my Commander for free, making the opportunity cost to play it in my deck very low.

What about you? What’re your best cards no one gives a second glance?

Edit 1: Fires doesn’t avoid commander tax. Still rad.

Edit 2: My Hazoret list