Leaving aside the fact that I liked the artwork, I'm also fond of cards with original self-made artworks in them, and on top of that, I liked the card in itself, so you got a big like from me
Really, Tekuthals only downside is its mono-blue commander color identity
Pyromancer Ascension and Harness the Storm are spell payoffs that don't really work in EDH, but become actual role-players alongside the instant/sorcery cards on this list, like Dragon's Approach or Slime Against Humanity
Additionally, Ayli can also spend 1 white and 1 black mana to exile a creature, which can help remove an opponents creature from the game
The creature side is totally fine, but the real exciting bit is the adventure half: making your opponent lose 1 life for every Knight you control is a huge manuever that can truly end games!" Possible combos: "This card is all about Knights, Knights, Knights