Is Ember Swallower legal in Standard, Modern, and Commander?

Ember Swallower is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Ember Swallower

Q: What type of card is Ember Swallower?

Ember Swallower is a Creature — Elemental. Its oracle text reads: "{5}{R}{R}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, each player sacrifices three lands of their choice. Power/Toughness: 4/5"