Is Brine Giant legal in Standard, Modern, and Commander?

Brine Giant is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Brine Giant

Q: What type of card is Brine Giant?

Brine Giant is a Creature — Giant. Its oracle text reads: "Affinity for enchantments (This spell costs {1} less to cast for each enchantment you control.) *The oracles of Meletis foresaw neither its rise from the depths nor the destruction it would leave in its wake.* Power/Toughness: 5/6"