Jeong Jeong, the Deserter (TLA)

Legendary Creature — Human Rebel Ally

Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.) Exhaust — {3}: Put a +1/+1 counter on Jeong Jeong. When you next cast a Lesson spell this turn, copy it and you may choose new targets for the copy. (Activate each exhaust ability only once.)

Reliable mana engine and Lesson payoff for red-based spell-slinger decks. Jeong Jeong generates incremental red mana whenever it attacks while offering a repeatable way to double up on Lesson spells through its exhaust ability, making it a solid glue piece in strategies built around instant and sorcery synergies. The mana production is efficient enough to enable explosive turns, and the spell-copying effect rewards you for playing the cards you'd already want. Best in Commander and Pioneer spell-heavy builds, though it demands a critical mass of Lessons to justify the deck slot.

Avatar: The Last Airbender — Uncommon