Is Goblins of the Flarg legal in Standard, Modern, and Commander?

Goblins of the Flarg is legal in: Legacy, Vintage, Commander, Pauper.

Goblins of the Flarg

Q: What type of card is Goblins of the Flarg?

Goblins of the Flarg is a Creature — Goblin Warrior. Its oracle text reads: "Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)When you control a Dwarf, sacrifice Goblins of the Flarg."

Creature — Goblin Warrior

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)<br>When you control a Dwarf, sacrifice Goblins of the Flarg.

Set The Dark

Rarity Common

Artist Tom Wänerstrand