Is Quagmire legal in Standard, Modern, and Commander?

Quagmire is legal in: Legacy, Vintage, Commander.

What type of card is Quagmire?

Quagmire is an Enchantment. Its oracle text reads: "Creatures with swampwalk can be blocked as though they didn't have swampwalk."

Enchantment

Creatures with swampwalk can be blocked as though they didn't have swampwalk.

Set Legends

Rarity Uncommon

Artist Dan Frazier

Enchantment Commander Legacy Vintage