Is Jeong Jeong, the Deserter legal in Standard, Modern, and Commander?

Jeong Jeong, the Deserter is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Jeong Jeong, the Deserter?

Jeong Jeong, the Deserter is a Legendary Creature — Human Rebel Ally. Its oracle text reads: "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.)"

Jeong Jeong, the Deserter

Legendary Creature — Human Rebel Ally

$0.16 ↗20 similarCommander, Modern

Firebending 1 (Whenever this creature attacks, add . This mana lasts until end of combat.)

Exhaust — : 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.)