Is Moor Fiend legal in Standard, Modern, and Commander?

Moor Fiend is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Moor Fiend?

Moor Fiend is a Creature — Horror. Its oracle text reads: "Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)"

Creature — Horror

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Set Ice Age

Rarity Common

Artist Anson Maddocks

Creature Commander Pauper Legacy