Is Dub legal in Standard, Modern, and Commander?

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

Dub

Q: What type of card is Dub?

Dub is an Enchantment — Aura. Its oracle text reads: "Enchant creature Enchanted creature gets +2/+2, has first strike, and is a Knight in addition to its other types. (It deals combat damage before creatures without first strike.)"

Enchantment — Aura

Enchant creature

Enchanted creature gets +2/+2, has first strike, and is a Knight in addition to its other types. (It deals combat damage before creatures without first strike.)

Set Core Set 2021

Rarity Common

Mana Value 3

Artist Bastien L. Deharme

Collector # 16

Scryfall Gatherer