Brazen Sneak

When Brazen Sneak enters the battlefield target
player reveals their hand. Then you may exile an artifact from that players hand or that they
control until Brazen Sneak leaves the battlefield.
You may cast that card for as long as it remains exiled, when you do it becomes a Treasure in
addition to its other types and gains "{t}, Sacrifice
this permanent: Add one mana of any color."
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Treasure is only treasure if someone else will