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Yes it is, according to WotCs post on the warp mechanic

They go in a separate deck called the Contraption deck

Artifacts are historically the most powerful card type in the game, and almost every time there has been an artifact-focused set it has caused something to get banned one way or another (Tolarian Academy, Memory Jar, Seat of the Synod, Skullclamp, Mox Opal, etc)

FromTheShire: Hands down one of the best uncommon signpost cards, it's costed fairly, it flies, it poisons, and then it just keeps ever increasing pressure on your opponent

You can cast it again from your graveyard for seven mana to look at the top seven and choose two of them