Is Mage Duel legal in Standard, Modern, and Commander?

Mage Duel is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Mage Duel

Q: What type of card is Mage Duel?

Mage Duel is a Sorcery. Its oracle text reads: "This spell costs {2} less to cast if you've cast another instant or sorcery spell this turn. Target creature you control gets +1/+2 until end of turn. Then it fights target creature you don't control. (Each deals damage equal to its power to the other.)"

Sorcery

$0.03 ↗20 similarCommander, Modern

This spell costs less to cast if you've cast another instant or sorcery spell this turn.

Target creature you control gets +1/+2 until end of turn. Then it fights target creature you don't control. (Each deals damage equal to its power to the other.)

Set Strixhaven: School of Mages

Rarity Common

Mana Value 3

Artist Randy Vargas

Collector # 137