Its owner will control the creature, and it will remain on the battlefield even if you leave the game (if you don't own it)
(I always imagine it like being what youd get if chess had certain edge cases where rooks could fly, bishops could teleport, or for a second, pawns were driving tanks.) Since the game is built around several thousand collectible cards, and almost every card has some additional unique ability to it one way or the other, it creates an endlessly manipulable, constantly surprising experience
You could lose both the creature and the artifact on the same turn, but the condition is on the creature, not the artifact
Prophetic Prism (for Tron) and High Tide (for combo) were unbanned
answering the few cards that can disrupt these decks will give you a huge edge, and you also have game against various strategies that attempt to go way over the top
Total annihilation