Is Goblin Goliath legal in Standard, Modern, and Commander?

Goblin Goliath is legal in: Legacy, Vintage, Commander, Historic.

What type of card is Goblin Goliath?

Goblin Goliath is a Creature — Goblin Mutant. Its oracle text reads: "When this creature enters, create a number of 1/1 red Goblin creature tokens equal to the number of opponents you have. {3}{R}, {T}: If a source you control would deal damage to an opponent this turn, it deals double that damage to that player instead. Power/Toughness: 5/4"