The passing of the sai presages the end of the old clan and the ascent of the new.

この釵を渡すことは、古き一族の終焉と、新しきものの昇進を示す。

忍びの釵

装備しているクリーチャーは＋１/＋１の修整を受ける。
クリーチャーが１体あなたのコントロール下で戦場に出るたび、あなたは忍びの釵をそれにつけてもよい。
装備{2}

忍钗交接，象征旧部中落，新部兴起。

忍者钗

佩带此武具的生物得+1/+1。
每当一个生物在你的操控下进战场时，你可以将忍者钗装备于其上。
佩带{2}

Sai of the Shinobi

Equipped creature gets +1/+1.
Whenever a creature you control enters, you may attach Sai of the Shinobi to it.
Equip {2}

Masters 25

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}

Planechase Anthology

Planechase 2012

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.