Siege of Towers
Guildpact — rare
Sorcery
Siege of Towers rulings:
2008-08-01: A noncreature permanent that turns into a creature can attack, and its abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn’t matter how long the permanent has been a creature.
2006-02-01: The Mountain will remain a creature for the rest of the game. It doesn’t have a creature type.