Even early on I feel MTG has a great grasp on single-colour identity, but not so much on multi-coloured ones
Oathsworn Knight I have always thought highly of this 3-mana creature and I think with its two devotion count for three mana, could see some play in a mono-black devotion deck
$1.79 Darien, King of Kjeldor Murders at Karlov Manor Commander Decks $4.49 Tempt with Bunnies Bloomburrow Commander Decks $5.99 Secure the Wastes Dragons of Tarkir $1.99 Deploy to the Front Universes Beyond: Warhammer 40,000 $1.99 Sram's Expertise Aether Revolt $2.99 White Sun's Twilight Phyrexia: All Will Be One $11.99 Call the Coppercoats Commander 2020 $1.49 Horn of Valhalla Commander Legends: Battle for Baldur's Gate $2.99 Skrelv's Hive Phyrexia: All Will Be One $4.49 Will of the Mardu Tarkir: Dragonstorm Commander Decks $1.79 Cruel Celebrant War of the Spark $1.49 Monastery Mentor Tarkir: Dragonstorm Commander Decks 0 results found
Card x1 126+1 card types 24 Packs per booster box, 12 Cards per pack.
Triskaidekaphiles card draw is okay, if not a little expensive
In other words, mono-red aggro is more akin to solitaire than chess