Exhaustion

#37

Sorcery

Creatures and lands target opponent controls don't untap during their next untap step.

Legalities

standardpioneermodernlegacyvintagepaupercommanderbrawl

Rulings (2)

2004-10-04 The creatures and lands are only prevented from untapping during the targeted player’s next untap step. They can still can untap during other player’s untap steps.
2009-10-01 No creatures or lands controlled by the player will untap during their next untap step. This includes those which entered the battlefield after Exhaustion resolved.