Instant, 3W (4)
Uncommon
Choose one — Tap all Spirits; or tap all non-Spirit creatures.
"The strain upon the veil between worlds began to show near the end of the Kami War. Strange happenings that neither side could control lashed out across Kamigawa."
—Observations of the Kami War
Illus. Stephen Tappin

6/1/2005: You choose the mode on announcement.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern