Misstep
Mercadian Masques — common
Sorcery
Misstep rulings:
2008-08-01: No creature controlled by the player will untap during their next untap step. This includes creatures which entered the battlefield after Misstep resolved.
2004-10-04: The creatures are only prevented from untapping during the targeted player’s next untap step. They can still can untap during other player’s untap steps.