Mono-Red Aggro is a fast, aggressive deck with several different flavors. Some versions rely heavily on creatures, using cards like Burning-Tree Emissary, Anax, Hardened in the Forge and Embercleave. Others are more focused on quickly reducing the opponent’s life total to zero with cards like Play with Fire, Lightning Strike and Eidolon of the Great Revel. While all of these versions can be successful in the hands of skilled players, I believe in the ‘Cleave.
In this article, I’ll take a closer look at the Mono-Red Embercleave archetype, including its key cards, sideboard strategies, and gameplay tips to get you started.

Love the article, very informative. BUT I’m 99% sure a flipped KFK does add devotion, flipped cards keep the MV of their flipped side.
They keep the Mana Value, but not the Mana Cost. Devotion checks Mana Cost.
After 20 games this deck feels slow and clunky in the MtG Arena environment at best. 5-15 is the record so far-very disappointed in its ability to get people dead.
The most significant issue I have found is not being able to break through creature matchups without having Cleave, and with no drawing or filtering it’s a crapshoot. The aggressive mulliganing results in very clunky hands frequently.