2007-10-01 : 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.

2007-10-01 : Doran’s ability means, for example, that a 2/3 creature will assign 3 damage in combat instead of 2.

2007-10-01 : This effect is mandatory and affects all creatures.