Equipped creature gets +1/+1. Whenever a creature enters the battlefield under your control, you may attach Sai of the Shinobi to it. Equip
The passing of the sai presages the end of the old clan and the ascent of the new.
Official Rulings for Sai of the Shinobi
6/1/2012 : If you choose not to attach Sai of the Shinobi to the creature, or if you can't (perhaps because the creature has protection from artifacts or has left the battlefield by the time the trigger resolves), Sai of the Shinobi doesn't move.
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