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

Catacomb Dragon is legal in: Legacy, Vintage, Commander.

Catacomb Dragon

Q: What type of card is Catacomb Dragon?

Catacomb Dragon is a Creature — Dragon. Its oracle text reads: "FlyingWhenever Catacomb Dragon becomes blocked by a nonartifact, non-Dragon creature, that creature gets -X/-0 until end of turn, where X is half the creature's power, rounded down."

Creature — Dragon

Flying<br>Whenever Catacomb Dragon becomes blocked by a nonartifact, non-Dragon creature, that creature gets -X/-0 until end of turn, where X is half the creature's power, rounded down.

Set Mirage

Rarity Rare

Artist David O'Connor