Is Draco legal in Standard, Modern, and Commander?

Draco is legal in: Legacy, Vintage, Commander.

Draco

Q: What type of card is Draco?

Draco is an Artifact Creature — Dragon. Its oracle text reads: "Domain — This spell costs {2} less to cast for each basic land type among lands you control. Flying Domain — At the beginning of your upkeep, sacrifice this creature unless you pay {10}. This cost is reduced by {2} for each basic land type among lands you control."

Artifact Creature — Dragon

Domain — This spell costs less to cast for each basic land type among lands you control.

Flying

Domain — At the beginning of your upkeep, sacrifice this creature unless you pay . This cost is reduced by for each basic land type among lands you control.