Spore Cloud | Magic: The Gathering
Formats Spore Cloud is Legal in
Official Oracle Text for Spore Cloud
Official Rulings for Spore Cloud
10/1/2008 : If a creature affected by Spore Cloud is untapped at the time its controller's next untap step begins, the "doesn't untap" effect doesn't do anything. It won't apply at some later time when that creature is tapped.
10/1/2008 : Spore Cloud doesn't track the creatures' controllers. If an affected creature changes controllers before its old controller's next untap step, Spore Cloud will prevent it from being untapped during its new controller's next untap step.