What type of card is Mirror Mirror?

Q: What type of card is Mirror Mirror?

Mirror Mirror is an Artifact. Its oracle text reads: "This artifact enters tapped. {7}, {T}, Sacrifice this artifact: Choose target player. At the beginning of the next end step, exchange life totals with that player, exchange control of all permanents you and that player control, and exchange cards in your hands, cards in your libraries, and cards in your graveyards."

Mirror Mirror

Artifact

This artifact enters tapped.

, , Sacrifice this artifact: Choose target player. At the beginning of the next end step, exchange life totals with that player, exchange control of all permanents you and that player control, and exchange cards in your hands, cards in your libraries, and cards in your graveyards.