What type of card is Time Machine?

Q: What type of card is Time Machine?

Time Machine is an Artifact. Its oracle text reads: "{T}: Exile this artifact and target nontoken creature you own. Return them to the battlefield at the beginning of your upkeep on your turn X in the next game you play with one of your opponents in this game, where X is the mana value of the exiled creature."

Time Machine

Artifact

: Exile this artifact and target nontoken creature you own. Return them to the battlefield at the beginning of your upkeep on your turn X in the next game you play with one of your opponents in this game, where X is the mana value of the exiled creature.