Is Sphere of Reason legal in Standard, Modern, and Commander?

Sphere of Reason is legal in: Legacy, Vintage, Commander.

What type of card is Sphere of Reason?

Sphere of Reason is an Enchantment. Its oracle text reads: "If a blue source would deal damage to you, prevent 2 of that damage."

Enchantment

If a blue source would deal damage to you, prevent 2 of that damage.

Set Odyssey

Rarity Uncommon

Mana Value 4

Artist Christopher Moeller

Collector # 51

Scryfall Gatherer

Enchantment Commander Legacy Vintage

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