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.
10/1/2008: If an affected land later loses the supertype snow, Balduvian Conjurer's effect doesn't end. The land will remain a creature until end of turn.