Is Sunstone legal in Standard, Modern, and Commander?

Sunstone is legal in: Legacy, Vintage, Commander.

What type of card is Sunstone?

Sunstone is an Artifact. Its oracle text reads: "{2}, Sacrifice a snow land: Prevent all combat damage that would be dealt this turn."

Artifact

, Sacrifice a snow land: Prevent all combat damage that would be dealt this turn.

Set Ice Age

Rarity Uncommon

Artist Phil Foglio

Artifact Commander Legacy Vintage