Sai of the Shinobi

Oracle Text

Equipped creature gets +1/+1.

Whenever a creature enters the battlefield under your control, you may attach Sai of the Shinobi to it.

Equip 2

Card Rulings

3/16/2018 If you choose not to attach Sai of the Shinobi to a creature that enters the battlefield, or if you can’t (most likely because the creature has left the battlefield by the time the triggered ability resolves), Sai of the Shinobi doesn’t move.