Jade Idol

Artifact, 4 (4)
Whenever you cast a Spirit or Arcane spell, Jade Idol becomes a 4/4 Spirit artifact creature until end of turn.¹
Before the Kami War, the shishi were symbolic guardians, protecting the shrines where they stood. But after the kami turned on the material world, shishi began pouncing from their perches to attack would-be supplicants.
Illus. Ben Thompson

Gatherer Card Rulings [Nov 2009]

• 8/1/2008: A noncreature permanent that turns into a creature is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be activated, if its controller has continuously controlled that permanent since the beginning of his or her most recent turn.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/8)	Champions of Kamigawa (Uncommon)