Is Dromoka, the Eternal legal in Standard, Modern, and Commander?

Dromoka, the Eternal is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Dromoka, the Eternal

Q: What type of card is Dromoka, the Eternal?

Dromoka, the Eternal is a Legendary Creature — Dragon. Its oracle text reads: "Flying Whenever a Dragon you control attacks, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)"

Legendary Creature — Dragon

Flying

Whenever a Dragon you control attacks, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)

Set Commander 2017

Rarity Rare

Mana Value 5

Artist Eric Deschamps

Collector # 170

Scryfall Gatherer