Is Tattermunge Duo legal in Standard, Modern, and Commander?

Tattermunge Duo is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Tattermunge Duo

Q: What type of card is Tattermunge Duo?

Tattermunge Duo is a Creature — Goblin Warrior Shaman. Its oracle text reads: "Whenever you cast a red spell, this creature gets +1/+1 until end of turn. Whenever you cast a green spell, this creature gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)"

Creature — Goblin Warrior Shaman

Whenever you cast a red spell, this creature gets +1/+1 until end of turn.

Whenever you cast a green spell, this creature gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

Set Shadowmoor

Rarity Common

Mana Value 3

Artist Jesper Ejsing

Collector # 218

Scryfall Gatherer