Is Stormbreath Dragon legal in Standard, Modern, and Commander?

Stormbreath Dragon is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Stormbreath Dragon

Q: What type of card is Stormbreath Dragon?

Stormbreath Dragon is a Creature — Dragon. Its oracle text reads: "Flying, haste, protection from white{5}{R}{R}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)When Stormbreath Dragon becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand."

Creature — Dragon

Flying, haste, protection from white<br>: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)<br>When Stormbreath Dragon becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand.