Doran, the Siege Tower | Magic: The Gathering
Formats Doran, the Siege Tower is Legal in
Official Oracle Text for Doran, the Siege Tower
Official Rulings for Doran, the Siege Tower
10/1/2007 : Doran's ability doesn't actually change creatures' power; it changes only the value of the combat damage they assign. All other rules and effects that check power or toughness use the real values.
10/1/2007 : This effect is mandatory and affects all creatures.